Restoring a cluster from the HDR secondary server

You can restore the primary server from the High-availability Data Replication (HDR) secondary server that you prepared to use as a backup server before you migrated or reverted the cluster. After you restore the primary server, you must recreate the other servers in the high-availability cluster.

Prerequisite: You prepared the HDR secondary server to use as a contingency backup server, according to information in Preparing to migrate, upgrade, or revert clusters.

To restore a cluster from the HDR secondary server:

  1. Start the HDR secondary server by running an oninit command.
  2. Change the secondary server to the primary server by running the onmode -d make primary hdr_server_name command.
  3. If the server is in quiescent mode, change it to multi-user mode by running an onmode -m command.
  4. Make a level-0 backup using the ON-Bar or ontape utility.
  5. Recreate the rest of the high-availability cluster.