Recovery group server failover

When, as is recommended, a recovery group is assigned two servers, one server is the preferred and primary server for the recovery group and the other server is the backup server. Only one server can serve the recovery group at any given time; this server is known as the active recovery group server. The server that is not currently serving the recovery group is the standby server. If the active recovery group server is unable to serve a recovery group, it will relinquish control of the recovery group and pass it to the standby server, if available. The failover from the active to the standby server should be transparent to any GPFS file system using the vdisk NSDs in the recovery group. There will be a pause in access to the file system data in the vdisk NSDs of the recovery group while the recovery operation takes place on the new server. This server failover recovery operation involves the new server opening the component disks of the recovery group and playing back any logged RAID transactions.

The active server for a recovery group can be changed by the IBM Storage Scale RAID administrator using the mmchrecoverygroup command. For planned temporary recovery group reassignment use the mmchrecoverygroup command to change the active server for maintenance operations. This command can also be used to change the primary and backup servers for a recovery group.

See the mmchrecoverygroup command for more information.