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36 Understanding Veritas Volume Manager
Volume layouts in VxVM
Figure 1-12 Example of concatenation
You can use concatenation with multiple subdisks when there is insufficient
contiguous space for the plex on any one disk. This form of concatenation can be
used for load balancing between disks, and for head movement optimization on
a particular disk.
Figure 1-13 shows data spread over two subdisks in a spanned plex. The blocks
n, n+1, n+2 and n+3 (numbered relative to the start of the plex) are contiguous
on the plex, but actually come from two distinct subdisks from two distinct
physical disks.
The remaining free space in the subdisk disk02-02 on VM disk disk02 can be
put to other uses.
disk01
VM disk
Physical disk
Plex with
Data blocksn n+1 n+2 n+3
devname
disk01-01 disk01-03
disk01-01 disk01-03
Subdisks
nn+1
n+2 n+3
disk01-02
Data in
disk01-01
Data in
disk01-03
disk01-03disk01-01
concatenated subdisks