Page 1 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide INKS Document organization Release notes and readme Getting help Table of Contents MK-97DF8124-26...
Page 2 (hereinafter referred to as “Hitachi”). Hitachi, Ltd. and Hitachi Data Systems reserve the right to make changes to this document at any time without notice and assume no responsibility for its use. Hitachi, Ltd. and Hitachi Data Systems products and services can only be ordered under the terms and conditions of Hitachi Data Systems' applicable agreements.
Page 3: Table Of Contents
Cascade restrictions with SnapShot P-VOL ..... . . 1-12 LU shared with P-VOL on SnapShot and P-VOL on TrueCopy ..1-13 Contents Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 4 Concurrent use of Dynamic Provisioning ......2-18 Contents Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 5 Restoring the P-VOL from the V-VOL ......6-6 Use the V-VOL for tape backup, testing, reports, etc....6-7 Contents Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 6 Sample back up script for Windows ......B-19 Contents Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 7 SnapShot with Cache Partition Manager ......D-2 Glossary Index Contents Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 8 Contents Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 9: Preface
This preface includes the following information: Intended audience Product version Release notes and readme Document revision level Changes in this revision Document organization Document conventions Convention for storage capacity values Related documentation Getting help Preface Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 10: Intended Audience
Intended audience This document is intended for system administrators, Hitachi Data Systems representatives, and Authorized Service Providers who install, configure, and operate Hitachi Adaptable Modular System (AMS) 2000 family storage systems. Product version This document applies to Hitachi AMS 2000 Family firmware version 08D1/D or later.
Page 11: Document Revision Level
Revision 23 supersedes and replaces MK-97DF8124-22. MK-97DF8124-24 December 2013 Revision 24 supersedes and replaces MK-97DF8124-23. MK-97DF8124-25 January 2015 Revision 25 supersedes and replaces MK-97DF8124-24. MK-97DF8124-26 January 2016 Revision 26 supersedes and replaces MK-97DF8124-25. Preface Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 12: Changes In This Revision
Provides information for using SnapShot with Cache SnapShot with Cache Partition Manager. Partition Manager Glossary Provides definitions for terms and acronyms found in this document. Index Provides locations to specific information in this document. Preface Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 13: Document Conventions
[ a | b ] indicates that you can choose a, b, or nothing. { a | b } indicates that you must choose either a or b. underline Indicates the default value. Example: [ a | b ] xiii Preface Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 14: Convention For Storage Capacity Values
1,024 PB or 1024 bytes Related documentation The AMS 2000 Family user documentation is available on the Hitachi Data Systems Portal: https://portal.hds.com. Please check this site for the most current documentation, including important updates that may have been made after the release of the product.
Page 15 AMS 2000 Family Fibre Channel Host Installation Guide, MK-08DF8189 Describes how to prepare Hitachi AMS 2000 Family Fibre Channel storage systems for use with host servers running supported operating systems. AMS 2000 Family iSCSI Host Installation Guide, MK-08DF8188 Describes how to prepare Hitachi AMS 2000 Family iSCSI storage systems for use with host servers running supported operating systems.
Page 16 AMS 2000 Family TrueCopy Extended Distance User Guide, MK-97DF8054 Describes how to perform bi-directional remote data protection that copies data over any distance without interrupting applications, and provides failover and recovery capabilities. Preface Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 17 AMS 2000 Family storage systems. The symbol identifies documents that contain initial configuration information about Hitachi AMS 2000 Family storage systems. AMS 2100/2300 Storage System Hardware Guide, MK-97DF8010 Provides detailed information about installing, configuring, and maintaining an AMS 2100/2300 storage system.
Page 18 Command and Control (CCI) The following documents describe how to install the Hitachi AMS 2000 Family Command Control Interface (CCI) and use it to perform TrueCopy and ShadowImage operations. AMS 2000 Family Command Control Interface (CCI) Installation Guide, MK-97DF8122 Describes how to install CCI software on open-system hosts.
Page 19 Dynamic Replicator documentation The following documents describe how to install, configure, and use Hitachi Dynamic Replicator to provide AMS Family storage systems with continuous data protection, remote replication, and application failover in a single, easy-to-deploy and manage platform. Hitachi Dynamic Replicator - Scout Release Notes, RN-99DF8211...
Page 20: Getting Help
Getting help If you need to contact the Hitachi Data Systems support center, please provide as much information about the problem as possible, including: • The circumstances surrounding the error or failure. • The exact content of any messages displayed on the host systems.
Page 21: Snapshot Overview
SnapShot overview Copy-on-Write SnapShot creates virtual copies of data volumes within the Hitachi Adaptable Modular Storage (AMS) array. These copies can be used for recovery from logical errors. They are identical to the original volume at the point in time they were taken.
Page 22: Copy-On-Write Snapshot Software
(V-VOLs), data pool, a differential management logical unit (DMLU), and command device. These elements are explained in this chapter. The SnapShot system is operated using Hitachi Storage Navigator Modular 2 (Navigator 2) graphical user interface (GUI), Navigator 2 Command-Line interface (CLI), and Hitachi Command Control Interface (CCI).
Page 23: How Snapshot Works
(P-VOL), and from 1 to 32 virtual volumes (V-VOLs), which contain virtual copies of the P- VOL. The P-VOL and its V-VOL(s) are located in the same array. SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 24: Data Pools
P-VOL, until the next snapshot is taken. A data pool can be shared by multiple SnapShot pairs. The data pool’s function in the SnapShot process is illustrated in Figure 1-2. SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 25 • Figure 1-2: V-VOL Maintains SnapShot Data SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 26: Consistency Group (Ctg)
To diversify the load, create two or more data pools whose ownerships differ, and specify the data pool to be equal when creating a SnapShot pair. SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 27 After deleting a pair, set ownership again considering load balance. Refer to Setting the LU ownership on page 5-7 or, for CLI, Setting the LU ownership on page B-13 for more information. SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 28: Interfaces For Performing Snapshot Operations
CLI, though the GUI is an option. The same recommendation applies to CCI users. • NOTE: Hitachi Replication Manager is used to manage and integrate Copy- on-Write. It provides a GUI topology view of the SnapShot system, with monitoring, scheduling, and alert functions. For more information on purchasing Replication Manager, visit the Hitachi Data Systems website http://www.hds.com/products/storage-software/hitachi-replication-...
Page 29: Cascade Connection Of Snapshot With Simple Dr
• Restoration of the SnapShot pair cascaded with the Simple DR P-VOL can be done only when the status of the Simple DR pair is Simplex, Split, or Pool Full. SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 30: Cascade Connection Of Snapshot With Simple Dr P-Vol
R/W: Read/Write by a host is impossible. • NOTE: Failure in this table excludes a condition in which access of an LU is not allowed (for example, LU blockage). 1-10 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 31: Cascade Connection Of Snapshot With Simple Dr S-Vol
V-VOLs of up to 32 generations can be made even in the case where the P-VOL of SnapShot is cascaded with the P-VOL and S-VOL of Simple DR in the same way as in the case where no cascade connection is made. 1-11 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 32: Cascade Connection Of Snapshot With Truecopy
Synchronizing status or Paired status of TrueCopy, the data in the LUs for P-VOL that are cascaded using TrueCopy on the local side and the remote side cannot be assured of equality. 1-12 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 33: Lu Shared With P-Vol On Snapshot And P-Vol On Truecopy
P-VOL of SnapShot on the remote side is possible or not in the case where a P-VOL of SnapShot and an S-VOL of TrueCopy are the same LU. 1-13 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 34: V-Vols Number Of Snapshot
When cascading volumes of TrueCopy with a SnapShot V-VOL, create a SnapShot pair first. When a TrueCopy pair is created earlier, split the TrueCopy pair once and create a pair using SnapShot. 1-14 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 35 R/W: Read/Write by a host is impossible. • NOTE: Failure in this table excludes a condition in which access of an LU is not allowed (for example, LU blockage). 1-15 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 36: Configuration Restrictions On The Cascade Of Truecopy With Snapshot
The I/O performance, in case of the sequential write pattern, deteriorates approximately 20% to 30% by releasing a part of the user data area in the cache memory and performing the memory 1-16 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 37 When the memory reconfiguration processing fails on the way due to the factors other then the time-out RAID group grown operation Replication Pair operation Dynamic Provisioning operation Cache Residency Manager setting operation Logical Unit formatting operation 1-17 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 38 Reconfiguring(nn%) Indicates the status that the memory reconfiguration is operating. (nn%) shows reconfiguring as a percent. Indicates that it is out of the memory reconfiguration target. 1-18 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 39: Cascade Connection Of Snapshot With Shadowimage
SnapShot can be cascaded with those of ShadowImage as shown Figure 1-8. However, the ShadowImage P-VOL and the SnapShot V-VOL can not be cascaded. Also, the ShadowImage S-VOL and the SnapShot V-VOL cannot be cascaded 1-19 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 40 Specify the ownership so that the the load can be diversified. Also, the Loadbalancing feature does not apply to a ShadowImage pair that is cascaded with a SnapShot pair. 1-20 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 41 Figure 1-9: LU ownership 1-21 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 42: Cascade Connection With P-Vol Of Shadowimage
P-VOL of ShadowImage is possible or not in the case where a P-VOL of SnapShot and a P-VOL of ShadowImage are the same LU. 1-22 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 43 R: Read by a host is possible but write is impossible. W: Write by a host is possible but read is impossible. R/W: Read/Write by a host is impossible. 1-23 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 44: Cascade Restrictions With S-Vol Of Shadowimage
SnapShot pair status is Split, all data of the P-VOL of SnapShot is saved to the V-VOL. Be careful of the free capacity of the data pool used by the V-VOL. 1-24 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 45 R: Read by a host is possible but write is impossible. W: Write by a host is possible but read is impossible. R/W: Read/Write by a host is impossible. 1-25 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 46 If a pair in the Paired status, the Synchronizing status, or the Reverse Synchronizing status is included in the pair that the P- VOL concerned configures, the item of Paired, Synchronizing, and Reverse Synchronizing is applied, respectively. 1-26 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 47: Pair Operation Restrictions When Cascading Snapshot With Shadowimage . 1-27
P-VOL on ShadowImage and P-VOL on SnapShot (1) SnapShot Pair Status ShadowImage Reverse Failure Operation Paired Split Failure Synchronizing (Restore) Creating pairs Splitting pairs Re-synchronizing pairs Restoring pairs Deleting pairs 1-27 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 48 S-VOL on ShadowImage and P-VOL on SnapShot (1) SnapShot Pair Status ShadowImage Reverse Failure Operation Paired Split Failure Synchronizing (Restore) Creating pairs Splitting pairs Re-synchronizing pairs Restoring pairs Deleting pairs 1-28 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 49 Split Failure Failure Paired Operation Synchroni Sync Split Pendin Failure (Restor (S_VOL Internal zing hroni Switch) zing Synchro nizing) Creating pairs Splitting pairs Re-synchronizing pairs Restoring pairs Deleting pairs 1-29 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 50: Simultaneous Cascading Restrictions With Shadowimage P-Vol And S-Vol
SnapShot pairs using the data pool for SnapShot in the relevant pair configuration, the performance deterioration occurs at the time of execution. To change the ownership, perform it when the load of the array is low. 1-30 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 51: Cascade Restrictions Of Truecopy With Shadowimage And Snapshot
TrueCopy pair status is Paired or Synchronizing, ShadowImage cannot be restored. Change the TrueCopy pair status to Split, and then execute it again. Figure 1-13: Cascade restrictions of TrueCopy S-VOL with SnapShot V-VOL 1-31 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 52 1-32 SnapShot overview Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 53: Planning And Design
Assessing business needs Establishing data pool size Requirements and recommendations for SnapShot Logical Units Operating system considerations Cascading SnapShot with TrueCopy Cascading SnapShot with TrueCopy Extended Distance Maximum supported capacity 2–1 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 54: The Plan And Design Workflow
To determine how often a snapshot should be taken Decide how much data could be lost in a disaster without significant impact to the business. Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 55: Selecting A Reasonable Time Between Snapshots
Lifespan based on backup requirements • If the snapshot is to be used for tape backups, the minimum lifespan must be => the time required to copy the data to tape. For example: Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 56: Lifespan Based On Business Uses
In this case, your SnapShot system would require 4 V-VOLs, since there are four 12-hour intervals during the 48-hour period. This is illustrated in Figure 2-1. • Figure 2-1: V-VOL Frequency, Lifespan Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 57: Establishing Data Pool Size
To collect workload data and size the data pool 1. Using your operating system’s performance monitoring software, collect the following: Disk-write bytes/second for every physical volume that will be replicated. Collect this data at 10 minute intervals. Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 58 6 10-minute intervals. If copy frequency is 4 hours, then calculate 240 minute rolling averages using the values in 24 10-minute intervals. Figure 2-4 illustrates 60-minute rolling averages. Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 59 C4. It then calculates all the point in time averages and populates the C cells. Figure 2-5 illustrates rolling averages graphed over raw measurement data averages. Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 60 (V-VOLs) is 4. 6. It is highly recommended that a safety factor of 20%, be calculated. Do so using the following formula: (Base data pool size) x 1.2. For example: Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 61: Rule-Of-Thumb Calculation
= 622,080 MB This is the size of the data pool with growth factored for the second year. Rule-of-thumb calculation When write-workload has not been measured, Hitachi suggests the change rates shown in Table 2-1. • Table 2-1: Workload Rates when No Measurement...
Page 62: Requirements And Recommendations For Snapshot Logical Units
Locate a P-VOL and associated data pool in different ECC groups within a RAID group, as shown in Figure 2-6. When they are in the same ECC group, performance decreases and the chance of failure increase. 2-10 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 63 RAID. Performance improves, however, when the RAID levels and number of drives are the same. Table 2-2 shows RAID configurations for the P-VOL and data pool. 2-11 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 64 AMS array, assign them to respective RAID groups. This safeguards the SnapShot system in the event of system malfunction, in which case both DM-LUs would become unavailable. 2-12 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 65: Operating System Considerations
Group IDs, corrupting or removing data associated with the host groups. To keep specified host groups you do not want to remove, please cancel this operation and make changes to only one host group at a time. 2-13 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 66: Lu Mapping
A host cannot recognize both a P-VOL and its V-VOL at the same time. Map the P-VOL and V-VOL to separate hosts. Windows 2000 • A P-VOL and S-VOL cannot be made into a dynamic disk on Windows Server 2000. 2-14 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 67: Windows Server And Snapshot Configuration
Windows mountvol command because the data residing in server memory is not flushed. The CCI mount command does flush data in server memory, which is necessary for SnapShot operations. For more information, see the Hitachi Adaptable Modular Storage Command Control Interface (CCI) Reference Guide.
Page 68: Linux And Lvm Configuration
Concurrent use of Cache Partition Manager When SnapShot is used together with Cache Partition Manager, please refer to the Hitachi Storage Navigator Modular 2 Storage Features Reference Guide . VMWare and SnapShot configuration When creating a backup of the virtual disk in the vmfs format using SnapShot, shutdown the virtual machine that accesses the virtual disk, and then split the pair.
Page 69 3. Also, since the object ID of the virtual OS changes after the re- registration when the middleware is used, review the setting. 2-17 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 70: Concurrent Use Of Dynamic Provisioning
SnapShot. However, the normal LU and the DP-VOL cannot coexist in the same data pool. The points remember when using SnapShot and Dynamic Provisioning together are described as follows. Refer to the Hitachi Adaptable Modular Storage Dynamic Provisioning User's Guide for the detailed information regarding Dynamic Provisioning.
Page 71 DP pool of SnapShot. • Pair status at the time of DP pool capacity depletion 2-19 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 72 DP Pool Statuses, DP Pool Capacity Statuses, and DP Pool Optimization Statuses Pair Operation DP in Capacity in Capacity Normal Regressed Blocked Optimization Growth Depletion Create pair Create pair (split option) 2-20 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 73: User Data Area Of Cache Memory
Also, by using TCE and Dynamic Provisioning together, the user data area may further decrease. Table 2-6 Table 2-13 show the cache memory secured 2-21 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 74 For Dynamic Provisioning, the user data area differs depending on DP Capacity Mode. Refer to the Hitachi Adaptable Modular Storage Dynamic Provisioning User's Guide for detailed information. Table 2-6: Supported Capacity of the Regular Capacity Mode (1 of 2) W Rev.
Page 75 1 GB/CTL 80 MB 2 GB/CTL 512 MB 4 GB/CTL 2 GB AMS2300 1 GB/CTL 140 MB 2 GB/CTL 512 MB 4 GB/CTL 2 GB 8 GB/CTL 4 GB 2-23 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 76 6,140 MB 2,040 MB 5,420 MB 8,320 MB 8,020 MB 2,900 MB 6,440 MB 9,980 MB 9,680 MB 3,540 MB 8,480 MB 14,060 MB 13,760 MB 5,580 MB 2-24 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 77 1,250 MB AMS2300 500 MB 830 MB 1,440 MB 1,130 MB 610 MB 2,350 MB 3,280 MB 2,970 MB 930 MB 4,410 MB 7,160 MB 6,850 MB 2,750 MB 2-25 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 78 520 MB 512 MB 4 GB/CTL 1.5 GB 6 GB/CTL 3 GB 8 GB/CTL 4 GB 10 GB/CTL 5 GB 12 GB/CTL 6 GB 16 GB/CTL 8 GB 2-26 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 79: Windows 2000/Windows Server And Dynamic Disk
Windows or use the Rescan Disks command after creating or re-synchronizing a SnapShot pair, there are cases where the V-VOL is displayed as Foreign in Disk Management and become inaccessable. 2-27 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 80: Limitations Of Dirty Data Flush Number
For less than 08C3/F, even though the DMLU will not automatically become unformatted, make sure to format the DMLU. It is possible to format a DMLU without having to release the DMLU. 2-28 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 81: Cascading Snapshot With Truecopy
Read/write and pair operations are limited when a SnapShot pair is cascaded with TrueCopy. Please see the appendix on cascading in the Hitachi Adaptable Modular Storage TrueCopy Remote Replication User Guide (MK-DF978052) for full information. 2-29 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 82: Cascading Snapshot With Truecopy Extended Distance
V-VOLs of up to 32 generations can be made even in the case where the P-VOL of SnapShot is cascaded with the P-VOL and S-VOL of TCE in the same way as in the case where no cascade connection is made. 2-30 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 83: Maximum Supported Capacity
Capacity is calculated using the following volumes, if used: SnapShot P-VOLs TCE P-VOLs and S-VOLs TrueCopy P-VOLs and S-VOLs ShadowImage S-VOLs 2-31 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 84: Snapshot And Tce Capacity
1. List the size of each P-VOL in the Storage system. For example: P-VOL 1 = 100 GB P-VOL 2 = 50 GB 2. Calculate managed P-VOL capacity, using the formula: ROUNDUP (P-VOL capacity / 15.75) * 15.75 For example: 2-32 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 85 3. Add the quotient to total data pool capacity. The following uses the example data pool capacity from above: 77 GB = 61 = 138 GB Managed capacity is well below maximum supported capacity. 2-33 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 86: Maximum Supported Capacity Of P-Vol And Data Pool2-34
TCE capacity ÷ 5 + Total data pool capacity < 4.7 TB 6 GB/CTL Total P-VOL of SnapShot and P-VOL (S-VOL) of TCE capacity ÷ 5 + Total data pool capacity < 9.4 TB 2-34 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 87: No Snapshot-Tce Cascade Configuration
SnapShot and TCE in Table 2-15 Table 2-17. 1 TB×4 LU ÷ 5 + less than 0.6 TB < 1.4 TB Figure 2-10: No SnapShot-TCE cascade configuration 2-35 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 88: Snapshot-Tce Cascade Configuration
2-17. You need only to add volumes of SnapShot in the formula. 1 TB×2 LU ÷ 5 + less than 1 TB < 1.4 TB Figure 2-11: SnapShot-TCE cascade configuration 2-36 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 89: Snapshot, Tce, Shadowimage Concurrent Capacity
2 GB per CTL 4 GB per CTL 6 GB per CTL 8 GB per CTL 10 GB per CTL 12 GB per CTL 16 GB per CTL 2-37 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 90 Change the P-VOL size • Reduce the number of P-VOLs • Change the data pool size • Reduce the number of V-VOLs • Reduce the lifespan of the V-VOL 2-38 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 91: Cache Limitations On Data And Data Pool Volumes
All P-VOL Capacity Ratio of All P-VOL Capacity to All Data Pool Capacity to All Data Pool Capacity (TB) 1:0.5 17.1 : 8.5 10.0 : 10.0 3.7 : 11.1 2-39 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 92 (TB) 1:0.5 34.2 : 17.1 20.0 : 20.0 7.5 : 22.5 • Figure 2-12: Relation of Data Volume, Data Pool Volume Capacities to Cache Size — per Controller 2-40 Planning and design Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 93: System Requirements
System requirements This chapter describes minimum system requirements and supported platforms. System requirements Supported platforms 3–1 System requirements Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 94: System Requirements
Version 4.00 or later is required for the management PC for an AMS 2500 array where the hardware Rev. is 0100. Version 9.00 or later is required for the management PC for an AMS2100, 2300, and 2500 where the hardware Rev. is 0200.
Page 95: Displaying The Hardware Revision Number
Displaying the hardware revision number The hardware revision (Rev.) number can be displayed when an individual array is selected from the Arrays list using Navigator 2, version 9.00 or later. • System requirements Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 96: Supported Platforms
Red Hat Linux AS/ES 4.0 (IA32) Red Hat Linux AS/ES 3.0 (AMD64/EM64T) Red Hat Linux AS/ES 4.0 (AMD64/EM64T) Red Hat Linux AS/ES 3.0 (IA64) Red Hat Linux AS/ES 4.0 (IA64) IRIX 6.5.x System requirements Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 97: Installing And Enabling Snapshot
SnapShot must be installed on AMS using a license key. It can also be disabled or uninstalled. This chapter provides instructions for performing these tasks. Important prerequisite information Installing or uninstalling SnapShot Enabling or disabling SnapShot 4–1 Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 98: Important Prerequisite Information
If the array is not restarted, there is not effect on TCE pair status. • Hitachi recommends changing TrueCopy or TCE pair status to Split before installing SnapShot on the remote array. NOTE: When SnapShot is used together with TCE, restarting the array by the function that is installed after the function that was installed first is not required.
Page 99 8. Confirm SNAPSHOT on the Name column of the Installed Storage Features list, and Pending on the Reconfigure Memory Status column. 9. Check the check box of SNAPSHOT, and click Reconfigure Memory. 10.A message appears, click Confirm. Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 100 Failure of Reconfigure Memory), ask the Support Center to solve the problem. Code-03 occurs when the copy of the management information in the cache memory fails. Installation of SnapShot is now complete. Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 101 Power Saving, the spin down may fail if the instruction is received immediately after the array restarts. When the spin-down fails, perform the spin-down again. Check that the spin-down Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 102 If it does not respond after 25 minutes or more, check the condition of the array. • 8. A message appears stating that the restart is successful. Click Close. Installation of SnapShot is now complete. Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 103 5. On the De-Install License screen, enter the code in the Key Code box, and then click OK. 6. On the confirmation screen to uninstall SnapShot, click Reconfigure Memory. • 7. A message appears. Click Close. Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 104 5. On the De-Install License screen, enter the code in the Key Code box, and then click OK. 6. On the confirmation screen to uninstall SnapShot, click Reboot Array. Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 105 Restart usually takes 6 to 25 minutes. If it does not respond after 25 minutes or more, check the condition of the array. Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 106 8. A message appears stating that the restart is successful. Click Close. • Un-installation of SnapShot is now complete. 4-10 Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 107: Enabling Or Disabling Snapshot
7. A message appears confirming that this optional feature is set. Click Reconfigure Memory. • The Licenses list appears. 8. Confirm Pending on the Reconfigure Memory Status column. 4-11 Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 108 4. To enable, check the Enable: Yes box. To disable, clear the Enable: Yes box. 5. Click OK. • • 6. A message appears confirming that this optional feature is set. Click Reboot Array. 4-12 Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 109 • 8. A message appears stating that the restart is successful. Click Close. • Enabling or disabling of SnapShot is now complete. 4-13 Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 110 4-14 Installing and enabling SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 111: Configuring Snapshot
Setting up the Differential Management LU (DMLU) Setting up the command device Setting the LU ownership Setting the System Tuning Parameter Cascade configuration of SnapShot and ShawdowImage Pair Resynchronization and Releasing 5–1 Configuring SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 112: Configuration Workflow
When Cache Partition Manager is used with SnapShot, the segment size of the LU belonging to a data pool must be the default size (16 kB) or less. See Hitachi Storage Navigator Modular 2 Storage Features Reference Guide for more information.
Page 113 Threshold value.If capacity reaches 100 percent, the pair fails and all data in the V-VOL is lost. 6. Select the Added LU for data pool. 7. Click OK. 8. A message displays. Click Close. • Configuring SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 114: Setting Up The Virtual Volume (V-Vol) (Manual Method)
LUN that matches the P-VOL in size. The lowest available LU number is the default. 6. Enter the V-VOL size in the Capacity field. The Capacity range is 1 MB - 128 TB. 7. Click OK. Configuring SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 115: Setting Up The Differential Management Lu (Dmlu)
3. Select the LUNs that you want to assign as DMLUs, and then click OK. A confirmation message displays. 4. Select the Yes, I have read... check box, then click Confirm. When a success message displays, click Close. Configuring SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 116: Setting Up The Command Device
LUN you want to add as a command device. A command device must be at least 33 MB. 4. Click the Add button. The screen refreshes with the selected LUN listed in the Command Device column. 5. Click OK. Configuring SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 117: Setting The Lu Ownership
2. Select Controller 0 or Controller 1 and X Core or Y Core, and then click OK. • The Core item is not displayed: AMS2100/2300 A message appears. Click Close. Configuring SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 118: Setting The System Tuning Parameter
2. Click Edit System Tuning Parameters. The Edit System Tuning Parameters screen appears. • 3. Select the Enable radio button of the Dirty Data Flush Number Limit. 4. Click OK. Configuring SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 119: Cascade Configuration Of Snapshot And Shawdowimage
Paired, the host I/O performance of the P-VOL may deteriorate. Operate TrueCopy in the Split pair status, and if needed, resynchronize the TrueCopy pair and acquire the backup. Configuring SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 120: Pair Resynchronization And Releasing
I/O response time and perform the resynchronization and the deletion at intervals as much as possible. 5-10 Configuring SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 121: Using Snapshot
Updating the V-VOL Restoring the P-VOL from the V-VOL Use the V-VOL for tape backup, testing, reports, etc. Editing a pair, data pool Deleting pairs, V-VOLs, data pools, DMLU. 6–1 Using SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 122: Snapshot Replication Workflow
2. On the array page under Common Array Tasks, click the Backup Volume link. The Backup Your Volume Wizard window opens. 3. On the Introduction screen, click Next. The Select Primary Volume screen displays. Using SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 123: Creating A Pair Using The Create Pair Procedure
For SnapShot, the secondary volume list contains the virtual volumes that have been previously set up. The size of the V-VOL must be equal to the P-VOL size. Using SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 124 P-VOL at the time of the split. Leave the Yes box unchecked to create the pair. The V-VOL will stay up-to-date with the P-VOL until the pair is split. Using SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 125 12. Click OK, then click Close on the confirmation screen that appears. The pair has been created. Using SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 126: Updating The V-Vol
P-VOL-to-V-VOL ratio. For a 100 GB P-VOL with a 1:1 ratio, it takes about five minutes. For a ratio of 1 P-VOL to 32 V-VOLs, deletion time is about 15 minutes. Using SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 127: Restoring The P-Vol From The V-Vol
The restore command can be issued to 128 P-VOLs at the same time, but actual copying is performed on a maximum of four per controller for AMS2100/2300, and eight per controller for AMS2500 at one time. When background copying can be executed, the copies are completed in the order the command was issued.
Page 128: Use The V-Vol For Tape Backup, Testing, Reports, Etc
7. Run the backup program using the snapshot image (V-VOL). • NOTE: When performing read operations against the snapshot image (V-VOL), you are effectively reading from the P-VOL. This extra I/O on the P-VOL affects the performance. Using SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 129: Tape Backup Recommendations
VOL. Therefore, the data pool should be as large or larger than this. It is recommended that the data pool be sized to 1.5 times the P-VOL capacity as a safety precaution. Figure 6-1 illustrates this example scenario. Using SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 130: Restoring Data From A Tape Backup
Use this method when the V-VOL is in Failure status (V-VOL data is corrupt), or when capacity of the data pool is less than 1.5-times the capacity of the P-VOL. 6-10 Using SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 131: Editing A Pair, Data Pool
1. Select the Local Replication icon in the Replication tree view. 2. In the GUI, select the pair you want to delete in the Pairs list. 3. Click Delete Pair. 6-11 Using SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 132 1. In the Replication tree view, select Setup and then DMLU. The Differential Management Logical Units list appears. 1. Select the LUN you want to remove. 2. Click the Remove DMLU button. A success message displays. 3. Click Close. 6-12 Using SnapShot Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 133: Monitoring And Maintenance
If a data pool should become full, the associated V-VOLs are invalidated, and backup data is lost. This chapter provides information and instructions for monitoring and maintaining the SnapShot system. Monitoring SnapShot Expanding data pool capacity 7–1 Monitoring and maintenance Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 134: Monitoring Snapshot
Status column. Click the Refresh Information button to make sure the data is current. Table 7-1 shows Navigator2 GUI status and descriptions. For CCI status (which differ), see Confirming pair status on page C-10. Monitoring and maintenance Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 135 Failure Copying is suspended due to a hardware failure or Read/Write. Read/Write. (Read/ data pool overflow. All V-VOLs become invalid. write not accepted during P-VOL restore.) Monitoring and maintenance Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 136: Monitoring Data Pool Usage
• Delete one or more V-VOLs. With fewer V-VOLs, less data accumulates in the data pool. Monitoring and maintenance Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 137 • A re-evaluation of your SnapShot system’s design may show that not enough data pool space was originally allocated. See Planning and design on page 2-1 for more information. Monitoring and maintenance Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 138 Monitoring and maintenance Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 139: Troubleshooting
Two types of problems can be experienced with a SnapShot system: pair failure and data pool capacity exceeded. This chapter discusses the causes and provides solutions for these problems. Pair failure Data pool capacity exceeded 8–1 Troubleshooting Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 140: Pair Failure
Expanding data pool capacity on page 7-4. Reduce the number of V-VOLs. Reduce the lifespan of V-VOLs.s 3. Re-create the pairs. See Creating a pair using the Create Pair procedure on page 6-3. Troubleshooting Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 141: Recovering From Pair Failure Due To A Hardware Failure
When Cache Partition Manager is used with SnapShot, the segment size of the LU belonging to a data pool must be the default size (16 kB) or less. See Hitachi Storage Navigator Modular 2 Storage Features Reference Guide for more information.
Page 142 Threshold value.If capacity reaches 100 percent, the pair fails and all data in the V-VOL is lost. 6. Select the Added LU for data pool. 7. Click OK. 8. A message displays. Click Close. • Troubleshooting Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 143 Troubleshooting Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 144 Troubleshooting Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 145: Specifications
Specifications This appendix provides external specifications for SnapShot. SnapShot specifications A–1 Specifications Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 146: Snapshot Specifications
A DP-VOL cannot be a P-VOL. Consistency Group (CTG) • Up to 256 consistency groups allowed per array. number • AMS2300/AMS2500: 2,046 pairs per CTG (maximum) • AMS2100: 1,022 pairs per CTG (maximum) A–2 Specifications Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 147 SnapShot pair. Restriction during RAID group A RAID group with a SnapShot P-VOL or V-VOL can be expansion expanded only when the pair status is Simplex or Paired. A–3 Specifications Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 148 V-VOL failure also. Potential effect caused by When the firmware version of the array is less than installation of the SnapShot 0897/A, reboot is required to acquire data pool function resources. A–4 Specifications Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 149 POOL capacity VOLs using the POOL become failure. is exceeded Reduction of memory Memory cannot be reduced when SnapShot, ShadowImage, TrueCopy, or TCE are enabled. Reduce memory after disabling the functions. A–5 Specifications Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 150 A–6 Specifications Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 151: Operations Using Cli
• NOTE: For additional information on the commands and their options used in this appendix, see the Storage Navigator 2 Command Line Interface Replication Reference Guide for AMS. B–1 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 152: Installing And Uninstalling Snapshot
TrueCopy or TCE pairs in Paired or Synchronizing status are changed to Failure pair status. Hitachi recommends changing TrueCopy or TCE pair status to Split before installing SnapShot on the remote array. When SnapShot is used together with TCE, restarting the array by the function that is installed after the function that was installed first is not required.
Page 153 Are you sure you want to continue? (y/n [n]): y Memory reconfiguring started successfully. 7. When the Reconfigure Memory Status is Failed(Code-04:Failure of Reconfigure Memory), execute the following reboot operation. B–3 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 154 Reconfigure Memory), ask the Support Center to solve the problem. Code-03 occurs when the copy of the management information in the cache memory fails. SnapShot installation is complete. B–4 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 155 % auopt -unit array-name -refer Option Name Type Term Status Reconfigure Memory Status SNAPSHOT Permanent --- Enable Normal SnapShot is installed and the status is “Enable”. SnapShot installation is complete. B–5 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 156: Uninstalling Snapshot
3. Execute the auopt command to confirm whether SnapShot has been uninstalled. For example: • % auopt –unit array-name –refer DMEC002015: No information displayed. SnapShot uninstall is complete. B–6 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 157: Enabling Or Disabling Snapshot
Enabling or disabling SnapShot SnapShot is bundled with the Adaptable array. You must enable it before using. Prerequisites The following conditions must be satisfied in order to disable SnapShot: B–7 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 158 3. Execute auopt to confirm whether the status has been changed. For example: • % auopt -unit array-name -refer Option Name Type Term Status Reconfigure Memory Status SNAPSHOT Permanent --- Disable Reconfiguring(10%) SnapShot Enable/Disable is complete. B–8 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 159 If it does not respond after 25 minutes, check the condition of the array. 3. Execute auopt to confirm whether the status has been changed. For example: B–9 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 160: Operations For Snapshot Configuration
3. A DMLU can be released only if two DM-LUs exist. If only one DMLU exists, it cannot be released. To release a DMLU, specify the -rm and -lu options in the audmlu command. B–10 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 161: Setting The Pool
First, display the LUs to be assigned to a Data Pool, and then create a Data Pool. The following is the example of specifying LU 100 for Data Pool 0. B–11 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 162 Are you sure you want to change the threshold of usage rate in the data pool? (y/n[n]): y The threshold of the data pool usage rate has been successfully changed. B–12 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 163: Setting The V-Vol
1. From the command prompt, register the array to which you want to set the LU ownership, and then connect to the array. 2. Execute the autuningluown command to confirm an LU ownership. B–13 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 164: Setting The System Tuning Parameter
1. From the command prompt, register the array on which you want to set a system tuning parameters and connect to that array. 2. Execute the ausystuning command to set the system tuning parameters. Example: • B–14 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 165: Performing Snapshot Operations
Refer to the following example. • % aureplicationlocal –unit array-name –ss –refer Pair name LUN Pair LUN Status Copy Type Group SS_LU0200_LU1001 200 1001 Split(100%) SnapShot ---:Ungrouped The SnapShot pair is created. B–15 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 166: Updating Snapshot Logical Unit Using Cli
SnapShot pair, then connect to the array. 2. Execute the aureplicationlocal command restore the pair. First, display the pair status, and then restore the pair. Refer to the following example. B–16 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 167: Releasing Snapshot Pairs Using Cli
DMEC002015: No information is displayed. The SnapShot pair is released. Changing pair information using CLI You can change the pair name, group name, and/or copy pace using CLI. B–17 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 168: Creating Multiple Snapshot Pairs That Belong To A Group Using Cli
SnapShot pairs that share the same P-VOL must use same Data Pool. 4. By repeating the step 3, the multiple pairs that belong to the same group can be created. B–18 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 169: Sample Back Up Script For Windows
Also, the GUID, which is displayed by the mountvol command, is needed as an argument to use mount command of CCI. B–19 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 170 B–20 Operations using CLI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 171: Operations Using Cci
This chapter describes basic CCI procedures for setting up and performing SnapShot operations. Setting up CCI Performing SnapShot operations Pair, group name differences in CCI and Navigator 2 C–1 Operations using CCI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 172: Setting Up Cci
3. Execute the aucmddev command to verify that the command device has been set. For example: • % aucmddev –unit array-name –refer Command Device LUN RAID Manager Protect 200 Disable Operations using CCI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 173: Setting Lu Mapping Information
NOTE: To set the alternate command device function or to avoid data loss and array downtime, designate two or more command devices. For details on alternate Command Device function, refer to the Hitachi Adaptable Modular Storage Command Control Interface (CCI) User’s Guide.
Page 174: Defining The Configuration Definition File
For details on configuration definition file, refer to the Hitachi Adaptable Modular Storage Command Control Interface (CCI) User’s Guide. The configuration definition file can be automatically created using the mkconf command tool.
Page 175 See the Hitachi Adaptable Modular Storage Command Control Interface (CCI) User’s Guide for more information. 5. In the HORCM_CMD section, specify the physical drive (command device) on the array.
Page 176 7. Save the configuration definition file. 8. Repeat Steps for the horcm1.conf file. Example: Figure C-3: Horcm1.conf Example (P-VOL: S-VOL=1: 3) • Figure C-4: Horcm1.conf Example (Cascading ShadowImage S-VOL with SnapShot P-VOL) Operations using CCI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 177 Operations using CCI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 178: Setting The Environment Variable
CCI and the array: • C:\>cd HORCM\etc C:\HORCM\etc>echo hd1-7 | .\inqraid Harddisk 1 -> [ST] CL1-A Ser =8100012385000123 LDEV = 200 [HITACHI ] [DF600F- Harddisk 2 -> [ST] CL1-A Ser =8100012385000123 LDEV = 2 [HITACHI ] [DF600F ] HORC = SMPL...
Page 179 (CL1-A , 1, 4-0 )85000123 4.SMPL ----,----- ---- VG01 oradb3(L) (CL1-A , 1, 2-2 )85000123 2.SMPL ----,----- ---- VG01 oradb3(R) (CL1-A , 1, 5-0 )85000123 5.SMPL ----,----- ---- Operations using CCI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 180: Performing Snapshot Operations
Synchronizing is being restored to the P-VOL. PSUS/ Split Status in which the P-VOL data at the time of the SSUS SnapShot instruction is retained in the V-VOL. C-10 Operations using CCI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 181: Paircreate Operation
3-0 )85000123 3.S-VOL SSUS,----- ---- - The pair status is displayed. For details on the pairdisplay command and its options, refer to Hitachi AMS 2000 Family Command Control Interface (CCI) Reference Guide. Paircreate operation To create SnapShot pairs NOTE: When not specifying the pair name, the name of the following is assigned to automatic.
Page 182: Pair Creation Using A Consistency Group
However, the -split option and the -m grp option cannot be used at the same time. Updating the V-VOL To update the V-VOL In the examples below, the group name in the configuration definition file is VG01. C-12 Operations using CCI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 183: Restoring A V-Vol To The P-Vol
3. Execute the pairsplit command. Pair status becomes PSUS. For example: • C:\HORCM\etc>pairsplit -g VG01 -d oradb1 The V-VOL is restored to the P-VOL. Releasing SnapShot pairs To release the SnapShot pair and change status to SMPL C-13 Operations using CCI Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 184: Pair, Group Name Differences In Cci And Navigator 2
Pairs defined in a group on the configuration definition file using CCI are displayed in Navigator 2 as ungrouped. For information about how to manage a group defined on the configuration definition file as a CTG, see the Hitachi Adaptable Modular Storage Command Control Interface (CCI) Reference Guide. C-14...
Page 185: Using Snapshot With Cache Partition Manager
Using SnapShot with Cache Partition Manager This chapter provides special instructions for using SnapShot with Cache Partition Manager. SnapShot with Cache Partition Manager D–1 Using SnapShot with Cache Partition Manager Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 186: Snapshot With Cache Partition Manager
SnapShot. Figure D-1 shows partitions before SnapShot is installed; Figure D-2 shows them with SnapShot. • Figure D-1: Cache Partitions with Cache Partition Manager Using SnapShot with Cache Partition Manager Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 187 • Figure D-2: Cache Partitions when SnapShot with Cache Partition Manager Using SnapShot with Cache Partition Manager Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 188 Using SnapShot with Cache Partition Manager Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 189: Glossary
Glossary This glossary provides definitions for replication terms as well as terms related to the technology that supports your Hitachi AMS array. Click the letter of the glossary section to display the related page. array A set of hard disks mounted in a single enclosure and grouped logically together to function as one contiguous storage space.
Page 190 (CCI) Hitachi’s Command Control Interface software provides command line control of Hitachi array and software operations through the use of commands issued from a system host. Hitachi’s CCI also provides a scripting function for defining multiple operations.
Page 191 (CLI) A method of interacting with an operating system or software using a command line interpreter. With Hitachi’s Storage Navigator Modular Command Line Interface, CLI is used to interact with and manage Hitachi storage and replication systems.
Page 192 The data is updated from the differential data control status (the pair volume is under the suspended status) to the primary volume. • A B C D E R S T X Y Z Glossary–4 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 193 A contiguous area of storage in a computer file system that is reserved for writing or storing a file. • A B C D E R S T X Y Z Glossary–5 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 194 P-VOL. The amount of differential data that can be managed per write command is limited by the difference between the • A B C D E R S T X Y Z Glossary–6 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 195 A logical description of a file is that it is a quantity of data • A B C D E R S T X Y Z Glossary–7 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 196 To mount a device or a system means to make a storage device available to a host or platform. • A B C D E R S T X Y Z Glossary–8 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 197 A hardware-based solution for mirroring logical volumes from a primary site (the application site) onto the volumes of a secondary site (the recovery site). • A B C D E R S T X Y Z Glossary–9 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 198 After a recovery operation, the RPO is the maximum desired time period, prior to a disaster, in which changes to data may be lost. This • A B C D E R S T X Y Z Glossary–10 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 199 Serial ATA is a computer bus technology primarily designed for the transfer of data to and from hard disks and optical drives. SATA is the • A B C D E R S T X Y Z Glossary–11 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 200 Storage Navigator Modular 2 A multi-featured scalable storage management application that is used to configure and manage the storage functions of Hitachi arrays. Also referred to as “Navigator 2.” suspended status Occurs when the update operation is suspended while maintaining the pair status.
Page 201 (P-VOL) on the local storage system and one secondary volume (S-VOL) on the remote storage systems. V-VOL See virtual volume. V-VOLTL Virtual Volume Tape Library. • A B C D E R S T X Y Z Glossary–13 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 202 The amount of data written to a volume over a specified period of time. • A B C D E R S T X Y Z Glossary–14 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 203: Index
C-11 create pairs general C-13 release pairs monitoring usage C-13 2-11 restore the P-VOL RAID configuration set environment variable requirements set LU mapping sizing set up the command device specifications Index-1 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 204 SnapShot interface interfaces for SnapShot interfaces maintaining overview lifespan, snapshot planning restoring the P-VOL operation Index-2 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 205 RAID configuration statuses volumes assigning to data pools 2-10 setup recommendations V-VOLs creating 6-10 deleting description establishing number of procedure for secondary uses updating write workload measuring rule of thumb change rates Index-3 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 206 Index-4 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 207 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 208 Hitachi Data Systems Corporate Headquarters 750 Central Expressway Santa Clara, California 95050-2627 U.S.A. Phone: 1 408 970 1000 www.hds.com info@hds.com Asia Pacific and Americas 750 Central Expressway Santa Clara, California 95050-2627 U.S.A. Phone: 1 408 970 1000 info@hds.com Europe Headquarters...
Page 209 Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide...
Page 210 Hitachi Data Systems Corporate Headquarters 2845 Lafayette Street Santa Clara, California 95050-2639 U.S.A. www.hds.com Regional Contact Information Americas +1 408 970 1000 info@hds.com Europe, Middle East, and Africa +44 (0)1753 618000 info.emea@hds.com Asia Pacific +852 3189 7900 hds.marketing.apac@hds.com MK-97DF8124-26...

This manual is also suitable for:

Ams2300 Ams 2500

Hitachi AMS2100 User Manual

Preface

1 Snapshot Overview

2 Planning and Design

3 System Requirements

4 Installing and Enabling Snapshot

5 Configuring Snapshot

6 Using Snapshot

7 Monitoring and Maintenance

8 Troubleshooting

Specifications

Operations Using CLI

Operations Using CCI

Using Snapshot with Cache Partition Manager

Glossary

Index

Quick Links

Related Manuals for Hitachi AMS2100

Summary of Contents for Hitachi AMS2100

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Table of Contents