VERITAS Volume Manager 4.1 Administrator's Guide

Performance Monitoring and Tuning
Performance Monitoring
Chapter 12404
where dest_disk is the disk to which you want to move the volume. It is
not necessary to specify a dest_disk . If you do not specify a dest_disk ,
the volume is moved to an available disk with enough space to contain
the volume.
For example, to move the volume from disk03 to disk04, use the
following command:
# vxassist move archive !disk03 disk04
This command indicates that the volume is to be reorganized so that no
part remains on disk03.
NOTE The graphical user interface (GUI) provides an easy way to move pieces
of volumes between disks and may be preferable to using the command
line.
If two volumes (other than the root volume) on the same disk are busy,
move them so that each is on a different disk.
If one volume is particularly busy (especially if it has unusually large
average read or write times), stripe the volume (or split the volume into
multiple pieces, with each piece on a different disk). If done online,
converting a volume to use striping requires sufficient free space to store
an extra copy of the volume. If sufficient free space is not available, a
backup copy can be made instead. To convert a volume, create a striped
plex as a mirror of the volume and then remove the old plex. For
example, the following commands stripe the volume archive across disks
disk02, disk03, and disk04, and then remove the original plex
archive-01:
# vxassist mirror archive layout=stripe disk02 disk03 disk04
# vxplex -o rm dis archive-01
After reorganizing any particularly busy volumes, check the disk
statistics. If some volumes have been reorganized, clear statistics first
and then accumulate statistics for a reasonable period of time.
If some disks appear to be excessively busy (or have particularly long
read or write times), you may want to reconfigure some volumes. If there
are two relatively busy volumes on a disk, move them closer together to
reduce seek times on the disk. If there are too many relatively busy
volumes on one disk, move them to a disk that is less busy.