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Slot numbers in enclosures
The IBM Storwize V3700 is made up of enclosures. There are six types of enclosures, as
described in Table 11-7.
Table 11-7 Enclosure slot numbering
Enclosure type
Number of slots
Enclosure 12x 3.5-inch drives:
򐂰 Control enclosure 2072-12C
򐂰 Expansion enclosure 2077-12E
Enclosure with 12 slots
Enclosure 24x 2.5-inch drives:
򐂰 Control enclosure 2072-24C
򐂰 Expansion enclosure 2072-24E
򐂰 Direct current (dc)-powered control
enclosure 2072-2DC
򐂰 dc-powered expansion enclosure 2072-2DE
Enclosure with 24 slots
Array goal
Each array has a set of goals that describe the location and performance of each array
member. A sequence of drive failures and hot spare takeovers can leave an array unbalanced
(with members that do not match these goals). The system automatically rebalances such
arrays when appropriate drives are available.
RAID level
An IBM Storwize V3700 disk array supports RAID 0, RAID 1, RAID 5, RAID 6, or RAID 10.
Each RAID level is described in Table 11-8.
Table 11-8 RAID levels that are supported by an IBM Storwize V3700 array
588
RAID
level
Where data is striped
Drive count
(Min - Max)
0
Arrays have no redundancy, and do not support hot-spare takeover. Data
is striped evenly across the drives without parity. Performance is improved
at the expense of the redundancy provided by other RAID levels.
1-8
1
Provides disk mirroring, which duplicates data between two drives. A
RAID 1 array is internally identical to a two-member RAID 10 array.
2
5
Arrays stripe data over the member drives with one parity strip on every
stripe. RAID 5 arrays have single redundancy, with higher space
efficiency than RAID 10 arrays, but with some performance penalty.
RAID 5 arrays can tolerate no more than one member drive failure.
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Implementing the IBM Storwize V3700