Installation guide

Software Operation Manual
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This chapter provides a brief introduction of RAID Concept and Understanding
RAID.
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1.1.1 Raid Set
A RAID set is a group of disk containing one or more volume sets. It has the
following features in the RAID subsystem. 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 existing RAID set of the user’s choice. If physical disk 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.
1.1.2 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 disk capacity available in a RAID set.
Multiple volume sets can exist on a group of disks in a RAID set.
In the illustration below, volume 1 can be assigned a RAID 5 level of operation
while volume 0 might be assigned a RAID 0+1 level of operation.
Raid Set 1 (3 Individual Disks)
Disk0 Disk1
Disk2
Free Space
Volume 1 (RAID 5)
Volume 0 (RAID 10)