Raid Configuration Guidelines - Digital Equipment Digital Server 3220 Series System Reference Manual

RAID Configuration Guidelines

•
Fault management must be supported and enabled by an optional RAID
adapter for disk drive hot swapping.
•
When adding a RAID adapter to a server that does not have RAID installed,
use the RAID software to configure your server for RAID operation.
•
Select the disk drives in the hot swap drive bays for hot-swap support in a
RAID server.
•
Use the same capacity drives in a RAID group; otherwise, the difference in
drive capacity will be lost.
•
Using external storage, the maximum number of logical drives in a RAID
group is 32.
•
To maximize the I/O performance of your multi-channel RAID subsystem
with external storage, connect each disk drive in a RAID group on a
separate SCSI channel. This enables the RAID adapter concurrent access
to all hot swap drives.
•
Supported RAID levels include: 0, 1, 0+1, 5, and RAID 7 (JBOD).
RAID
0
1
0 + 1
5
7
Note: Each RAID server comes configured as RAID 7 or JBOD (Just a Bunch of Disks)
Description
Striping - no redundancy
Mirroring
Striping and mirroring
Striping with parity
Single disk - no redundancy
(factory default)
SCSI Device Configurations
Drives Per RAID Group
2 - 8
2
3 - 8
3 - 8
1
7-7