IBM Flex System V7000 Expansion Enclosure 4939H29 Benutzerhandbuch
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4939H29
Chapter 8. Storage pools
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8068ch08-Storage Pools.fm
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 utilized as possible.
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 utilized as possible.
A client or storage administrator may have the need for either higher performance or for more
tolerance against failing drives. In such cases you would not use the recommended
configuration, but would rather choose a configuration which is optimized for performance as
shown in “Selecting a different configuration” on page 308.
tolerance against failing drives. In such cases you would not use the recommended
configuration, but would rather choose a configuration which is optimized for performance as
shown in “Selecting a different configuration” on page 308.
As shown in Figure 8-12 on page 306, when you click Use the recommended
configuration, the wizard offers a recommended storage configuration at the bottom of the
window.
configuration, the wizard offers a recommended storage configuration at the bottom of the
window.
Preset
Purpose
RAID
level
level
Drives
per
array
goal
per
array
goal
Spare
goal
goal
Chain balance
Basic
RAID 5
RAID 5
Protects against a single drive
failure. Data and one stripe of
parity are striped across all
array members.
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.
are from the same
chain wherever
possible.
Basic
RAID 6
RAID 6
Protects against two drive
failures. Data and two stripes
of parity are striped across all
array members.
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.
are from the same
chain wherever
possible.
Basic
RAID 10
RAID 10
Protects against at least one
drive failure. All data is
mirrored on two array
members.
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.
are from the same
chain wherever
possible.
Balanced
RAID 10
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.
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.
drives are from each
chain.
RAID 0
Provides no protection against
drive failures.
drive failures.
0
8
0
All drives in the array
are from the same
chain wherever
possible.
are from the same
chain wherever
possible.