Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

■ Non-Persistent FastResync holds the FastResync maps in memory. These maps
do not survive on a system that is rebooted.
By default, FastResync is not enabled on newly-created volumes. If you want to
enable FastResync on a volume that you create, specify the fastresync=on
attribute to the vxassist make command.
Note: You cannot configure Persistent and Non-Persistent FastResync on a volume.
If a DCO is associated with the volume, Persistent FastResync is used. Otherwise,
Non-Persistent FastResync is used.
To turn on FastResync for an existing volume, specify fastresync=on to the vxvol
command as follows:
# vxvol [-g diskgroup] set fastresync=on volume
To use FastResync with a snapshot, you must enable FastResync before the
snapshot is taken, and it must remain enabled until after the snapback is
completed.
Checking whether FastResync is enabled on a volume
To check whether FastResync is enabled on a volume, use the following command:
# vxprint [-g diskgroup] -F%fastresync volume
If FastResync is enabled, the command returns on; otherwise, it returns off.
If FastResync is enabled, to check whether it is Non-Persistent or Persistent
FastResync, use the following command:
# vxprint [-g diskgroup] -F%hasdcolog volume
If Persistent FastResync is enabled, the command returns on; otherwise, it returns
off.
To list all volumes on which Non-Persistent FastResync is enabled, use the
following command.
Note: The ! character is a special character in some shells. The following example
shows how to escape it in a bash shell.
# vxprint [-g diskgroup] -F "%name" \
-e "v_fastresync=on && \!v_hasdcolog"
339Administering volumes
Enabling FastResync on a volume