Datasheet

8068ch08-Storage Pools.fm Draft Document for Review January 29, 2013 12:52 pm
304 IBM Flex System V7000 Storage Node Introduction and Implementation Guide
Selecting Use the recommended configuration guides you through the wizard described in
“Using the recommended configuration” on page 305. Selecting Select a different
configuration uses the wizard described in “Selecting a different configuration” on page 308.
Before going through the storage configuration wizard, we first describe IBM Flex System
V7000 Storage Node RAID configuration presets.
RAID configuration presets
RAID configuration presets are used to configure internal drives based on recommended
values for the RAID level and drive class. Each preset has a specific goal for the number of
drives per array, the number of spare drives to maintain redundancy, and whether the drives
in the array are balanced across enclosure chains, thus protecting the array from enclosure
failures. For details about enclosure chains, refer to Chapter 2, “Introduction to IBM Flex
System V7000 Storage Node” on page 39.
Table 8-1 describes the presets that are used for solid-state drives (SSDs) for the IBM Flex
System V7000 Storage Node storage system.
Table 8-1 SSD RAID presets
Table 8-2 on page 305 describes the RAID presets that are used for hard disk drives for the
IBM Flex System V7000 Storage Node storage system.
Preset Purpose RAID
level
Drives per
array goal
Spare
drive
goal
SSD RAID 5 Protects against a single drive failure.
Data and one stripe of parity are
striped across all array members.
58 1
SSD RAID 6 Protects against two drive failures.
Data and two stripes of parity are
striped across all array members.
612 1
SSD RAID 10 Protects against at least one drive
failure. All data is mirrored on two array
members.
10 8 1
SSD RAID 0 Provides no protection against drive
failures.
08 0
SSD Easy Tier Mirrors data to protect against drive
failure. The mirrored pairs are spread
between storage pools to be used for
the Easy Tier function.
10 2 1
SSD RAID instances: In all SSD RAID instances, drives in the array are balanced across
enclosure chains if possible.