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Chapter 6: Volume Configuration 95
Creating a Concatenated Volume
The V-Switch
supports a maximum
of 512 volumes.
To accommodate large volumes of data or to best utilize small volumes
spread over several disks, you can concatenate physical volumes across
storage devices to create a larger virtual volume.
In Figure 43, the volume is divided into two equitable chunks to be
mapped across two disks. Data blocks 1 – 4 are mapped to Disk 1, blocks
13 – 16. Data blocks 5 – 8 are mapped to Disk 2, blocks 13 – 16.
10023
Virtual
Volume
Physical
Volume
Disk 1
S10 S11
S9 S12
S6 S7
S5 S8
S2 S3
S1 S4
S14 S15
S13 S16
S14 S15
S13 S16
Disk 2
S10 S11
S9 S12
S6 S7
S5 S8
S2 S3
S1 S4
Concatenated
Volume
B1 B2 B3 B4
B5 B6 B7 B8
Figure 43. Concatenated Volume Block Distribution
volume create concatenated
You need to define four parameters to create a concatenated volume:
SWITCH PARAMETER DEFINITION STATUS EXAMPLE
-vol
VOLUME NAME USER-ASSIGNED
VOLUME NAME
MANDATORY
Concat1
–nbc
NUMBER OF
CHILDREN
N
UMBER OF
VOLUMES OR
CHILDREN FROM
WHICH TO BUILD
STRIPED VOLUME
OPTIONAL
DEFAULT: 2
3
–ch
CHILD FIRST VOLUME
(CHILD) TO
COMBINE
MANDATORY
Simple5
–ch
CHILD SECOND VOLUME
(CHILD) TO
COMBINE
MANDATORY
Simple12
–ch
CHILD N VOLUME (CHILD)
TO COMBINE
MANDATORY
Simple14