VERITAS Volume Manager 3.1 Administrator's Guide

Volume Manager Operations
Common Volume Manager Commands
Chapter 3 143
The cleanup phase is performed with one transaction. The vxunreloc
command resets the comment field to a NULL string for all subdisks
marked as UNRELOC that reside on the destination disk. This includes
clean-up for those subdisks that were unrelocated in any previous
invocation of the vxunreloc command.
vxvol Command
The vxvol command performs Volume Manager tasks on volumes. Use
the vxvol command to:
• initialize a volume
• start a volume
• stop a volume
• establish the read policy for a volume
Starting a volume changes its kernel state from DISABLED or DETACHED
to ENABLED. Stopping a volume changes its state from ENABLED or
DETACHED to DISABLED. For more information about volume states, see
Chapter 8, Recovery,.
Use the vxvol command to specify one of these read policies:
• round
This option reads each plex in turn in “round-robin” fashion for each
nonsequential I/O detected. Sequential access causes only one plex to
be accessed. This takes advantage of the drive or controller
read-ahead caching policies.
• prefer
This option reads first from a plex that has been named as the
preferred plex.
• select
This option chooses a default policy based on plex associations to the
volume. If the volume has an enabled striped plex, the select option
defaults to preferring that plex; otherwise, it defaults to round-robin.
For more information, see the vxvol (1M) manual page.