APC RAID Subsystem SCSI-SATA II - Manual (Page 39)

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Each UDV will be associated with one specific CV (Cache Volume) to execute
the data transaction. Each CV could have different cache memory size from
user’s modification/setting. LUN is the logical volume/unit, which the users could
access through SCSI commands.
3.6.2 Physical disk
Enter “Physical disk” to view the status of hard drives inserted in the system.
The following are operation tips:
1. Multiple select. Select one or more checkboxes in front of the slot
number. Or select the checkbox at the top left corner will select all.
Check again will select none.
2. The list box will disappear if there is no VG or only VG of RAID 0,
JBOD. Because these RAID levels cannot be set as dedicated spare
disk.
3. These three functions “Free disc”, “Global spares”, “Dedicated
spares” can do multiple selects, too.
4. The operations of the other web pages (e.g.: volume config of VG, UDV,
CV, LUN pages) are similar to previous steps.
VG
PD 2 PD 3 DS PD 1
UDV 1 UDV 2 Snap
UDV
RAM
Global CV Dedicated
CV
+
LUN 1 LUN 2 LUN 3
+
+