VERITAS Volume Manager 3.5 Administrator's Guide (September 2004)

Understanding VERITAS Volume Manager
Volume Layouts in VxVM
Chapter 120
subdisk disk01-01 on disk01. However, the last two blocks of data, B7
and B8, use only a portion of the space on the disk to which VM disk
disk02 is assigned.
The remaining free space on VM disk disk02 can be put to other uses. In
this example, subdisks disk02-02 and disk02-03 are available for other
disk management tasks.
Figure 1-14 Example of Spanning
CAUTION Spanning a plex across multiple disks increases the chance that a disk
failure results in failure of the assigned volume. Use mirroring or
RAID-5 (both described later) to reduce the risk that a single disk failure
results in a volume failure.
See “Creating a Volume on Any Disk” on page 221 for information on how
to create a concatenated volume that may span several disks.
B = Block of Data
VM Disks
Physical disks
Data in
disk01-0
Data in
disk02-0
Plex
disk01
disk01-01
disk02
disk02-01
disk02-02
disk02-03
B2
B1
B3
B4
B5
B6
B7
B8
devname1
devname2
disk02-01
disk02-03
disk01-01
disk02-02