5. Functions <Pool (3)>
RAID type Configuration
Number of immediately
accessible disks *
1
Number of immediately
non-accessible disks *
2
RAID-1/10 (1+1) x n 2 or more 1
RAID-5/50
(2 + P) x n 3 or more 1-2
(4 + P) x n 5 or more 1-4
(8 + P) x n 9 or more 1-8
RAID-6/60
(4 + PQ) x n 6 or more 1-5
(8 + PQ) x n 10 or more 1-9
RAID-TM (1 + 1 + 1) x n 3 or more 1-2
*
1
When adding the following number of physical disks, the expansion is completed immediately and
the logical disks are available for configuration.
*
2
When adding the following number of physical disks, the expansion time depends on the capacity
and the number of the added physical disks. The logical disks are available for configuration after
the expansion completes. The pool has approximately 10% more I/O load while expanding.
x Ⅹ
Add HDD
AfterBefore
Expand
(2-2) Expanding the Pool Capacity
You can expand the capacity of an existing pool by adding unused physical disks and incorporating
them into the pool. The added space becomes available to use for binding a new logical disk or
expanding the existing logical disk capacity. The expansion time depends on the pool type and the
number of disk drives added. Expansion can be executed on line during operation.
56
NEC Confidential
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