APC RAID Subsystem SCSI-SATA II - Manual (Page 38)

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Figure 3.5.5.1
Figure 3.5.5.2
3.6 Volume configuration
“Volume config” selection is for the setup of volume configurations including
“Physical disk”, “Volume group”, “User data volume”, “Cache volume”,
and “Logical unit” functions.
Figure 3.6.1
3.6.1 Volume relationship diagram
The below diagram describes the relationship of RAID components. One VG
(Volume Group) consists of a set of UDVs (User Data Volume) and owns one
RAID level attribute. Each VG can be divided into several UDVs. The UDVs from
one VG share the same RAID level, but may have different volume capacity.