IBM V7000 Introduction And Implementation Manual page 343

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
Preset Purpose
Basic Protects against a single drive
RAID 5 failure. Data and one stripe of
parity are striped across all
array members.
Basic Protects against two drive
RAID 6 failures. Data and two stripes
of parity are striped across all
array members.
Basic Protects against at least one
RAID 10 drive failure. All data is
mirrored on two array
members.
Balanced Protects against at least one
RAID 10 drive or enclosure failure. All
data is mirrored on two array
members. The mirrors are
balanced across the two
enclosure chains.
RAID 0 Provides no protection against
drive failures.
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.
RAID Drives Spare
level per goal
array
goal
5 8 1
6 12 1
10 8 1
10 8 1
0 8 0
Chapter 8. Storage pools
Chain balance
All drives in the array
are from the same
chain wherever
possible.
All drives in the array
are from the same
chain wherever
possible.
All drives in the array
are from the same
chain wherever
possible.
Exactly half of the
drives are from each
chain.
All drives in the array
are from the same
chain wherever
possible.
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