OpenEye GraniteRack 3U - Manual (Page 18)

Introduction
1-12
1.4 Array Definition
1.4.1 RAID Set
A RAID Set is a group of disks containing one or more volume sets. It has
the following features in the RAID subsystem controller:
1. Up to sixteen RAID Sets are supported per RAID subsystem controller.
2. From one to sixteen drives can be included in an individual RAID Set.
3. 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
specified RAID level desired, then the volume set will be created in the exist-
ing 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
organized 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 capacity 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.
Additional Volume Sets created in a specified RAID Set will reside on all the
physical 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.
1. 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.