Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Chapter 8, Administering Volumes
Enabling FastResync on a Volume
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◆ Non-Persistent FastResync holds the FastResync maps in memory. These do not
survive on a system that is rebooted.
By default, FastResync is not enabled on newly created volumes. Specify the
fastresync=on attribute to the vxassist make command if you want to enable
FastResync on a volume that you are creating.
Note It is not possible to configure both Persistent and Non-Persistent FastResync on a
volume. Persistent FastResync is used if a DCO is associated with the volume.
Otherwise, Non-Persistent FastResync is used.
To turn FastResync on for an existing volume, specify fastresync=on to the vxvol
command as shown here:
# vxvol [-g diskgroup] set fastresync=on volume
Note To use FastResync with a snapshot, FastResync must be enabled before the snapshot
is taken, and 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
This command returns on if FastResync is enabled; 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
This command returns on if Persistent FastResync is enabled; otherwise, it returns off.
To list all volumes on which Non-Persistent FastResync is enabled, use the following
command:
# vxprint [-g diskgroup] -F “%name” \
-e “v_fastresync=on && !v_hasdcolog”
To list all volumes on which Persistent FastResync is enabled, use the following
command:
# vxprint [-g diskgroup] -F “%name” -e “v_fastresync=on \
&& v_hasdcolog”