Creating a snapshot mirror of the source
To use the snapshot method with VxVM volumes in the third-mirror (split-mirror) configuration, you must create a snapshot mirror. Use one of the following methods on the client.
To create a snapshot mirror of the source
In the Volume Manager Storage Administrator interface:
UNIX: select the source (primary) volume, right-click it, and select Snapshot from the pop-up menu. In the Volume Snapshot dialog, select Enable FMR (if available: see the following note) and click the Snapstart option.
Windows: select the source volume, right-click it, select Snap, and choose Snapstart.
For details, refer to your Veritas Volume Manager documentation.
- Or for UNIX, enter the following commands:
/usr/sbin/vxassist -g disk_group snapstart volume_name /usr/sbin/vxvol -g disk_group set fmr=on volume_name
where:
disk_group is the Volume Manager disk group to which the volume belongs.
volume_name is the name of the volume that is designated at the end of the source volume path (for example, vol1 in /dev/vx/rdsk/dg/vol1).
fmr=on sets the Fast Mirror Resynchronization attribute, which resynchronizes the mirror with its primary volume. This attribute copies only the blocks that have changed, rather than performing a full resynchronization. Fast mirror resynchronization can dramatically reduce the time that is required to complete the backup.
Fast Mirror Resynchronization (FMR) is a separate product for Veritas Volume Manager.
- With the Media Server or Third-Party Copy method, the disks that make up the disk group must meet certain requirements.
See Disk requirements for Media Server and Third-Party Copy methods.
More Information