Enabling a cluster for IPv6

For newly created clusters, if any of the specified node interfaces on the mmcrcluster command resolves to an IPv6 address, the cluster is automatically enabled for IPv6. For existing IPv4-based clusters, follow the applicable procedure described in this section.

If you are performing the procedure during a scheduled maintenance window and GPFS can be shut down on all of the nodes in the cluster, issue the command:

mmchconfig enableIPv6=yes

After the command finishes successfully, you can start adding new nodes with IPv6 addresses.

If it is not possible to shut down GPFS on all of the nodes at the same time, issue the command:

mmchconfig enableIPv6=prepare

The next step is to restart GPFS on each of the nodes so that they can pick up the new configuration setting. This can be done one node at a time when it is convenient. To verify that a particular node has been refreshed, issue:

mmdiag --config | grep enableIPv6

The reported value should be 1.

Once all of the nodes have been recycled in this manner, issue the command:

mmchconfig enableIPv6=commit

This command will only succeed when all GPFS daemons have been refreshed. Once this operation succeeds, you can start adding new nodes with IPv6 addresses.

To convert an existing node from an IPv4 to an IPv6 interface, use one of the procedures described in Changing IP addresses or host names of cluster nodes.