184 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
Table 4-2 describes the RAID presets that are used for Enterprise SAS and Nearline SAS
drives for the IBM Storwize V5000 Gen2 storage system.
Table 4-2 Hard disk drive (HDD) RAID presets
Flash
RAID 1
Protects against at least one
drive failure. All data is mirrored
on two array members.
12 2 1
Flash
RAID 0
Provides no protection against
drive failures.
08 1 - 80
Flash
Easy Tier
Mirrors data to protect against
drive failure. The mirrored pairs
are spread between storage
pools to use for the Easy Tier
function.
10 2 4 - 16
(even
number of
drives)
1
Flash RAID instances: In all Flash RAID instances, drives in the array are balanced
across enclosure chains, if possible.
Preset Purpose RAI
D
leve
l
Drive
s per
array
goal
Drive
count (min
- max)
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 3 - 16 1 All drives in the
array are from the
same chain
wherever possible.
Distribut
ed RAID
5
Protects against a
single drive failure.
Data and one stripe
of parity are striped
across all array
members.
548 -
60
4 - 128 1: 0 - 36
2: 37 - 72
3: 73 -
100
4: 101 -
128
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 5 - 16 1 All drives in the
array
are from the same
chain wherever
possible.
Distribut
ed RAID
6
Protects against two
drive failures. Data
and two stripes of
parity are striped
across all array
members.
648 -
60
6 - 128 1: 0 - 36
2: 37 - 72
3: 73 -
100
4: 101 -
128
All drives in the
array
are from the same
chain wherever
possible.
Preset Purpose RAID
level
Drives
per array
goal
Drive
count
(min -
max)
Spare
drive goal
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