How to Perform a Point-in-Time Snapshot

In this procedure, point-in-time snapshot is used to synchronize the shadow volume of the primary cluster to the master volume of the primary cluster. The master volume is vol01, the bitmap volume is vol04, and the shadow volume is vol02.

Before You Begin

Ensure that you completed steps in How to Perform a Remote Mirror Replication.

Steps

1. Access nodeA as superuser.

2. Disable the resource that is running on nodeA.

   nodeA# /usr/cluster/bin/scswitch -n -j nfs-rs

3. Change the primary cluster to logging mode.

   nodeA# /usr/opt/SUNWesm/sbin/sndradm -n -l lhost-reprg-prim \ /dev/vx/rdsk/devicegroup/vol01 \ /dev/vx/rdsk/devicegroup/vol04 lhost-reprg-sec \ /dev/vx/rdsk/devicegroup/vol01 \ /dev/vx/rdsk/devicegroup/vol04 ip sync

   When the data volume on the disk is written to, the bitmap file on the same disk is updated. No replication occurs.

4. Synchronize the shadow volume of the primary cluster to the master volume of the primary cluster.

   nodeA# /usr/opt/SUNWesm/sbin/iiadm -u s /dev/vx/rdsk/devicegroup/vol02 nodeA# /usr/opt/SUNWesm/sbin/iiadm -w /dev/vx/rdsk/devicegroup/vol02

5. Synchronize the shadow volume of the secondary cluster to the master volume of the secondary cluster.

   nodeC# /usr/opt/SUNWesm/sbin/iiadm -u s /dev/vx/rdsk/devicegroup/vol02 nodeC# /usr/opt/SUNWesm/sbin/iiadm -w /dev/vx/rdsk/devicegroup/vol02

6. Restart the application on nodeA.

   nodeA# /usr/cluster/bin/scswitch -e -j nfs-rs

7. Resynchronize the secondary volume with the primary volume.

   nodeA# /usr/opt/SUNWesm/sbin/sndradm -n -u lhost-reprg-prim \ /dev/vx/rdsk/devicegroup/vol01 \ /dev/vx/rdsk/devicegroup/vol04 lhost-reprg-sec \ /dev/vx/rdsk/devicegroup/vol01 \ /dev/vx/rdsk/devicegroup/vol04 ip sync

Next Steps

Go to How to Verify That Replication Is Configured Correctly