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four hard drives.
RAID 10 Striping over the member RAID 1 volumes. RAID 10 needs at least
four hard drives.
RAID 30 Striping over the member RAID 3 volumes. RAID 30 needs at least six
hard drives.
RAID 50 Striping over the member RAID 5 volumes. RAID 50 needs at least six
hard drives.
RAID 60 Striping over the member RAID 6 volumes. RAID 60 needs at least
eight hard drives.
JBOD The abbreviation of “Just a Bunch Of Disks”. JBOD needs at least
one hard drive.
1.2.3 Volume relationship
The below graphic is the volume structure which D-LINK has designed. It describes the
relationship of RAID components. One RG (RAID group) consists of a set of VDs (Virtual
Disk) and owns one RAID level attribute. Each RG can be divided into several VDs. The
VDs in one RG share the same RAID level, but may have different volume capacity. All
VDs share the CV (Cache Volume) to execute the data transaction. LUN (Logical Unit
Number) is a unique identifier, in which users can access through SCSI commands.
Figure 1.2.3.1
RG
PD 2 PD 3 DS PD 1
VD 1 VD 2
Snapshot
VD
RAM
Cache Volume
+
LUN 1
LUN 2
LUN 3
+
+