Fujitsu ETERNUS DX80 S2 Cli User's Manual page 380

Chapter 4 Function/System Settings and Display
4.2 Advanced Copy Management
■ Copy parameter settings (required)
Set the internal table size to match the capacity of the volume to be copied, and the copy speed in the device.
Copy table size (table size) and resolution vary according to the copy capacity and number of sessions that are
operated at the same time.
• Resolution
This value determines the amount of data each bit in the copy bitmap represents.
The allowed resolution settings of "1 (standard)", "2", "4", ",8", and "16" respectively give 8KB, 16KB, 32KB,
64KB, and 128KB regions of data per bitmap bit. The same value is used for all the copy sessions in the
ETERNUS DX Disk storage system.
Set the resolution as small as possible. When a large value is specified, the performance may be reduced.
When unsure about whether the copy target area might be increased in future use, specify "16" for the
resolution.
To change the resolution of a copy session that is currently being performed, cancel the copy session and
start again.
• Internal table size
A dedicated memory area is required for Advanced Copy management and is allocated as a table size. The
table size and resolution settings are determined by the copy capacity and the number of sessions
(volumes) that will be run simultaneously.
(Table size (S)) [MB] = (S1) + (S2) + (S3)
S1: Refers to the table size (MB) for OPC / QuickOPC / SnapOPC / SnapOPC+ without EC/REC and OPC
Restoration.
S2: Refers to the table size (MB) for OPC / QuickOPC / SnapOPC / SnapOPC+ with OPC Restoration.
S3: 16 [KB]  N3 / 1024 (rounded up to the nearest integer)
N3: Number of OPC/EC/REC sessions for GlobalServer volumes
• Round the derived value up to the next multiple of 8 to obtain the correct setting for the copy table
size.
• A copy table of the appropriate size (as derived above) is created in each CM.
• If the total table size value (S) exceeds the maximum size allowed, adjust the resolution (M) upward
until the maximum table size is no longer exceeded. The resolution (M) should be as small as
possible.
• Maximum allowed table sizes are as follows:
ETERNUS DX80 S2
ETERNUS DX90 S2
ETERNUS DX410 S2
ETERNUS DX440 S2
ETERNUS DX8100 S2
ETERNUS DX8700 S2
• Allowance should be made for possible increases in the copy capacity.
• If the resolution is changed during an existing copy session, the table sizing formula described in this
section is not applied.
Device name
380
ETERNUS CLI User's Guide
Copyright 2015 FUJITSU LIMITED
Maximum copy table size (per CM)
256MB
256MB
512MB
1024MB
1024MB
12288MB
P2X0-1030-09ENZ0