D-Link DSN-6410 User Manual for DSN-6410 - Page 11

Volume relationship

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RAID 6 RAID 0+1 RAID 10 RAID 30 RAID 50 RAID 60 JBOD 2-dimensional parity protection over the member disks. RAID 6 needs at least four hard drives. Mirroring of the member RAID 0 volumes. RAID 0+1 needs at least four hard drives. Striping over the member RAID 1 volumes. RAID 10 needs at least four hard drives. Striping over the member RAID 3 volumes. RAID 30 needs at least six hard drives. Striping over the member RAID 5 volumes. RAID 50 needs at least six hard drives. Striping over the member RAID 6 volumes. RAID 60 needs at least eight hard drives. 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. LUN 1 LUN 2 LUN 3 VD 1 VD 2 Snapshot VD + + + RG Cache Volume PD 1 PD 2 PD 3 DS Figure 1.2.3.1 11 RAM

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11
RAID 6
2-dimensional parity protection over the member disks. RAID 6 needs
at least four hard drives.
RAID 0+1
Mirroring of the member RAID 0 volumes. RAID 0+1 needs at least
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
“J
ust a
B
unch
O
f
D
isks
”
. 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
+
+