Geographically mirrored volume groups configuration prerequisites

Edit online

Before configuring, ensure that you have completed all the tasks in the previous sections:

  • Installed GLVM for PowerHA® SystemMirror® Enterprise Edition on all nodes at each site.
  • Planned and configured the physical volumes, volume groups and logical volumes on the nodes at the local site using the standard AIX® SMIT interface.
Note: You can configure enhanced concurrent mode volume groups (that are also geographically mirrored) only if the PowerHA SystemMirror cluster is configured and the PowerHA SystemMirror cluster services are running on the nodes. Therefore, prior to configuring enhanced concurrent volume groups with RPVs, ensure that you start the cluster services on the nodes at the local (primary) site.
  • Planned and configured sites. If you have PowerHA SystemMirror installed, but have not used sites, add one local and one remote site to the cluster, ensuring that at least one node at each geographic location belongs to the site and that the inter-site management policy is not set to Ignore or to Online on both Sites.
  • Configured RPV server and client pairs on all nodes at each site for all volume groups that you plan to include in resource groups. Site names in PowerHA SystemMirror must match the site names defined for RPV servers. After you complete the configuration of RPV servers and clients for volume groups, RPV servers and clients must be in the defined state.
  • Added mirror copies to the volume groups and logical volumes using the GLVM Utilities SMIT interface.
  • Planned for PowerHA SystemMirror Enterprise Edition networks.

Management of RPVs in a PowerHA SystemMirror cluster

After RPVs become part of volume groups that belong to an active PowerHA SystemMirror cluster, PowerHA SystemMirror takes care of switching the RPV states between defined and available during cluster events.

If, for some reason, you must stop the cluster services and manage the RPVs manually, the RPVs must be configured in the defined state before you start the cluster services. This enables management of RPVs by PowerHA SystemMirror after the nodes join the cluster.