User`s guide

Connecting SCSI and RAID Adapters

9-2

RAID Configuration Guidelines

• Fault management must be supported and enabled by the host

adapter for disk drive hot swapping.

• When adding a RAID host adapter to a server that does not have

RAID installed, use the RAID software to configure your server for

RAID operation.

• Use narrow SBB disk drives with a narrow RAID host adapter.

• Select the disk drives in the SBB bays for hot-swap support in a

RAID server.

• Use the same capacity disk drives in a RAID group, otherwise the

difference in disk drive capacity will be lost.

• The maximum number of logical disk drives in a RAID group is

eight.

• To maximize the I/O performance of your multi-channel RAID

subsystem, connect each disk drive in a RAID group on a separate

SCSI channel. This enables the RAID host adapter concurrent

access to all disk drives.

• Supported RAID levels include: 0, 1, 0+1, 5, and RAID 7 (JBOD).

RAID Description Drives Per RAID Group (1

Channel)

Drives Per RAID Group

(3 Channel)

0 Striping - no redundancy 2 - 7

2 - 8

1 Mirroring 2

0 + 1 Striping and mirroring 3 - 7

3 - 8

5 Striping with parity 3 - 7

3 - 8

7 Single disk - no redundancy

(factory default)

(minimum to maximum)

Note: Each RAID server comes configured as RAID 7 or JBOD (Just a Bunch of Disks)