VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Enabling FastResync on a Volume

208 VERITAS Volume Manager Administrator’s Guide

Note It is not possible to conﬁgure both Persistent and Non-Persistent FastResync on a

volume. Persistent FastResync is used if a DCO object and a DCO volume are

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 Touse FastResyncwitha snapshot, FastResyncmustbe enabled beforethe 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”