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1.4 Array Definition
1.4.1 RAID Set
A RAID Set is a group of disks containing one or more volume sets. It is
impossible to have multiple RAID Sets on the same disks.
A Volume Set must be created either on an existing RAID set or on a group of
available individual disks (disks that are not yet a part of an raid set). If there
are pre-existing raid sets with available capacity and enough disks for speci-
fied RAID level desired, then the volume set will be created in the existing raid
set of the user's choice. If physical disks of different capacity are grouped
together in a raid set, then the capacity of the smallest disk will become the
effective capacity of all the disks in the raid set.
1.4.2 Volume Set
A Volume Set is seen by the host system as a single logical device. It is orga-
nized in a RAID level with one or more physical disks. RAID level refers to the
level of data performance and protection of a Volume Set. A Volume Set ca-
pacity can consume all or a portion of the disk capacity available in a RAID
Set. Multiple Volume Sets can exist on a group of disks in a RAID Set. Addi-
tional Volume Sets created in a specified RAID Set will reside on all the physi-
cal disks in the RAID Set. Thus each Volume Set on the RAID Set will have its
data spread evenly across all the disks in the RAID Set. Volume Sets of
different RAID levels may coexist on the same RAID Set.
In the illustration below, Volume 1 can be assigned a RAID 5 level of opera-
tion while Volume 0 might be assigned a RAID 0+1 level of operation.
Introduction
1-12
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