IBM Storwize V7000, Introduction And Implementation Manual, Page: 343 / 670

Chapter 8. Storage pools
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Table 8-2 describes the RAID presets that are used for hard disk drives for IBM Flex System
V7000 Storage Node.
Table 8-2 HDD RAID presets
Using the recommended configuration
When creating RAID arrays for the internal drives in IBM Flex System V7000 Storage Node,
performance and protection against drive failures are important factors to consider. Using the
recommended configuration generally builds RAID arrays using RAID 5, which gives good
performance with as many drives used as possible.
A client or storage administrator might have the need for either higher performance or more
tolerance against failing drives. In such cases, you would not use the recommended
configuration, but would rather choose a configuration that is optimized for performance as
shown in “Selecting a different configuration” on page 328.
Preset Purpose RAID
level Drives
per
array
goal Spare
goal Chain balance
Basic
RAID 5 Protects against a single drive
failure. Data and one stripe of
parity are striped across all
array members. 5 8 1 All drives in the array
are from the same
chain wherever
possible.
Basic
RAID 6 Protects against two drive
failures. Data and two stripes
of parity are striped across all
array members. 6 12 1 All drives in the array
are from the same
chain wherever
possible.
Basic
RAID 10 Protects against at least one
drive failure. All data is
mirrored on two array
members. 10 8 1 All drives in the array
are from the same
chain wherever
possible.
Balanced
RAID 10 Protects against at least one
drive or enclosure failure. All
data is mirrored on two array
members. The mirrors are
balanced across the two
enclosure chains. 10 8 1 Exactly half of the
drives are from each
chain.
RAID 0 Provides no protection against
drive failures. 0 8 0 All drives in the array
are from the same
chain wherever
possible.