VERITAS Volume Manager 4.1 Administrator's Guide

Administering Volumes

Enabling FastResync on a Volume

Chapter 8 299

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 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: