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40 Understanding Veritas Volume Manager
Volume layouts in VxVM
Figure 1-15 shows a striped plex with three equal sized, single-subdisk columns.
There is one column per physical disk. This example shows three subdisks that
occupy all of the space on the VM disks. It is also possible for each subdisk in a
striped plex to occupy only a portion of the VM disk, which leaves free space for
other disk management tasks.
Figure 1-15 Example of a striped plex with one subdisk per column
Figure 1-16 illustrates a striped plex with three columns containing subdisks of
different sizes. Each column contains a different number of subdisks. There is
one column per physical disk. Striped plexes can be created by using a single
subdisk from each of the VM disks being striped across. It is also possible to
allocate space from different regions of the same disk or from another disk (for
example, if the size of the plex is increased). Columns can also contain subdisks
from different VM disks.
Subdisks
Physical disks
Column 2
Striped plex
Stripe units
su2
su3
su5
su6
Column 0
devname3
devname2
devname1
.
.
.
.
.
.
.
.
.
su4su1
disk01
disk03disk02
disk03-01
disk01-01
VM disks
su1 su2
su3
su4 su5 su6
.
.
.
Column 1
disk03-01
disk01-01
disk02-01
disk02-01
disk03-01
disk01-01
disk02-01