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1.3 RAID
RAID (redundant array of independent disks) is the technology of grouping several hard disk drives into an
array
that is defined as a
single logical disk drive. This grouping technique greatly increases logical-disk capacity and data availability. In addition, if one disk
fails, the system continues to run (except in the case of RAID-0), with no operator intervention required, at reduced performance.
The failed disk can be replaced without turning off the server (
hot swapping
).
The SSA RAID Adapter provides RAID functions within the interface between your server and its disk drives. Disk drives connected
to the adapter can be configured as individual drives, as members of a RAID-0, RAID-1, or RAID-5 array, or as hot spares for future
use in an array. The members of an array can be disk drives only; that is, an array cannot be a member of another array.
If you need some basic information about RAID technology, refer to Appendix C, "Introducing SSA and RAID" in topic C.0.
SSA RAID Adapter Installation and User's Guide.
RAID
_ Copyright IBM Corp. 1996
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