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5. Functions <Pool (2)>
(2) Pool and Logical Disk: Configuration and Expansion
(2-1) Configuring a pool
It is recommended that a RAID consists of a combination of physical disks of the same capacity and
same rotation speed. The space configured in a pool is available to bind logical disks immediately.
The following list describes minimum and maximum disk drives in a dynamic pool. Refer to "Appendix:
Dynamic Pool Capacity List" for pool capacity.
RAID Type
RAID-1/10
RAID-5/50
RAID-6/60
RAID-TM
SSD: RAID-1, 10, 5/50 (4+P), 6/60 (4+P) only.
Note: Striping and the number of HDDs (RAID-10/50/60/TM)
A dynamic pool can be built with any combination of RAID type and number of HDD by using
virtualization technology. Striping is automatic when configuring a pool with more than twice the
minimum number of HDDs in each RAID type. For example, RAID-1 with 4 HDDs is automatically
configured as RAID-10. It is also possible to configure a pool with 3 HDDs in RAID-1, in which case,
it will be equivalent to the striping effect of RAID-10.
Note: Pool Configuration
In M-Series products, a system volume which manages performance logs etc. is automatically created
in the pool first created. The capacity of a system volume is 8.6GB (1GB=1000
(1G=1024
3
Byte).
When using DynamicDataReplication, it is recommended to create the master volume (MV) and the
replication volumes (RV) in the different pool. When using DynamicDataReplication or
RemoteDataReplication, it is also recommended to use the storage system information retention
function* and configure replication reserved volume by NEC StorageManager. The capacity of a
replication reserved volume is 8.6GB (1GB=1000
* Storage system information retention function: backup storage system information such as the
differential map between business volume (MV) and replication volume (RV) onto disk drives.
Refer to "5. Functions <Storage System Information Retention Function>" for more details.
Min. number of
Configuration
(1+ 1) x n
(2 + P) x n
(4 + P) x n
(8 + P) x n
(4 + PQ) x 2
(8 + PQ) x 2
(1 + 1 + 1) x n
Capacity utilization
disk drives
2
3
5
9
6
10
3
3
Byte) / 8.0GB (1G=1024
NEC Confidential
Max. number of
disk drives
50%
66%
80%
M110：120
88%
M310：480（2.5"）
66%
240（3.5"）
80%
33%
3
Byte) / 8.0GB
3
Byte).
55
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