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

Enabling FastResync on a Volume

252 VERITAS Volume Manager Administrator’s Guide

As the volumes are moved from the disk, the vxdiskadm program displays the status

of the operation:

VxVM vxevac INFO V-5-2-24 Move volume voltest ...

When the volumes have all been moved, the vxdiskadm program displays the

following success message:

VxVM INFO V-5-2-188 Evacuation of disk mydg02 is complete.

3. At the following prompt, indicate whether you want to move volumes from another

disk (y) or return to the vxdiskadm main menu (n):

Move volumes from another disk? [y,n,q,?] (default: n)

Enabling FastResync on a Volume

Note The recommended method for enabling FastResync on a volume with a version 20

DCO is to use the vxsnap prepare command as described in “Preparing a Volume

for DRL and Instant Snapshots” on page 235.

You need a VERITAS FlashSnap

or FastResync license to use this feature.

FastResync performs quick and efficient resynchronization of stale mirrors. It also

increases the efficiency of the VxVM snapshot mechanism when used with operations

such as backup and decision support. See “Administering Volume Snapshots” on

page 261 and “FastResync” on page 49 for more information.

There are two possible versions of FastResync that can be enabled on a volume:

◆ Persistent FastResync holds copies of the FastResync maps on disk. These can be used

for the speedy recovery of mirrored volumes if a system is rebooted. This form of

FastResync requires that either a version 0 or a version 20 data change object (DCO)

and DCO volume first be associated with the volume.

See “Adding a Version 0 DCO and DCO Volume” on page 307, and “Preparing a

Volume for DRL and Instant Snapshots” on page 235 for more information on version

0 and version 20 DCO volumes respectively.

If the existing volume was created in a previous release of VxVM, and it has any

attached snapshot plexes or it is associated with any snapshot volumes, follow the

procedure given in “Upgrading Existing Volumes to Use Version 20 DCOs” on

page 240.