Changing GLVM-mirrored resources configuration

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You can change the configuration of GLVM-mirrored resources.

For information about changing the sites, IP networks and other networks in PowerHA® SystemMirror®, see Administering PowerHA SystemMirror.

For information about changing the RPV servers and clients outside of PowerHA SystemMirror (when the cluster services are down on the nodes), see Configuring geographically mirrored volume groups.

If sites are defined in the PowerHA SystemMirror cluster, you cannot dynamically change the cluster resources. Therefore, in GLVM for PowerHA SystemMirror Enterprise Edition, you cannot dynamically apply changes to the resource groups that contain geographically mirrored volume groups.

To change the geographically mirrored volume groups, stop the cluster services on all nodes, and perform the changes outside of PowerHA SystemMirror on each node in the cluster. After the changes are complete, use the procedure in Preparing the geographically mirrored volume groups to be put under PowerHA SystemMirror control before reimporting the changed volume groups to the resource groups in the cluster.

Adding RPV disks in a running cluster

To add a disk to a geographically mirrored volume group in a running cluster, complete the following steps. Before following the steps however make sure that all of the disks have PVIDs assigned. If PVIDs are not assigned you must use the PVIDs using the chdev -a pv=yes -l hdisk3 (where hdisk3 was a new disk added to the system).

Steps for adding RPV disk to a GMVG in a running cluster are divided into different sets or blocks.

Use set 1 if you want to add an RPV disk to a site holding the primary instance of RG (for example, where the volume group is varied online and applications are running).

Use set 2 If you want to add an RPV disk at the remote site (where the volume group is offline or holding the secondary instance of RG). To add a new disk at both the sites complete both procedures.

Procedure 1: Adding an RPV disk at the primary site.
  1. On the node that has the volume group varied on, identify a new physical disk that will be added to the volume group. This disk must be accessible by all nodes at that site.
  2. On the node that has the volume group varied on, create RPV server instance for this disk. The Configure Automatically at System Restart field should be set to No. The field Start New Device Immediately should be set to Yes.
  3. Create the RPV server instance on all of the remaining nodes of this site using the disk. The field Configure Automatically at System Restart should be set to No. The field Start New Devices Immediately should be set to No.
  4. On the remote site node create an RPV client for the disk. Associating it with the RPV server instance created in prior step. The field Start New Devices Immediately should be set to No.
  5. Create an RPV client instance on all remaining nodes on the remote site. The field Start New Devices Immediately should be set to No.
  6. On the node having volume group varied on run the extendvg command from the command line to include the local physical volume in the volume group.
Procedure 2: Steps for adding a disk at the backup site
  1. On one of the remote site node (holding secondary instance of the Resource Group), identify a new physical disk that will be added to the volume group. This disk must be accessible by all nodes at that site.
  2. Create an RPV server instance for RPV disk. The Configure Automatically at System Restart should be set to No. The Start New Devices Immediately field should be set to No.
  3. Create RPV server instances on all other nodes of the remote site. The Configure Automatically at System Restart should be set to No. The field Start New Devices Immediately should be set to No.
  4. On the node that has the volume group varied on (primary instance of Resource Group) create RPV client instance for the disk. The Start New Devices Immediately should be set to Yes.
  5. RPV client on all other nodes on this site. The Start New Devices Immediately should be set to No.
  6. On the node that has the volume group varied on, (holding the primary instance of the Resource Group) use the extendvg command to extend the volume group to add or include the remote physical volume or disk to the volume group.
  7. Update the volume group definition on all of the other nodes at each site, enter smit sysmirror from the command line.
  8. From the SMIT interface, select System Management (C-SPOC) > Storage > Volume Groups > Synchronize a Volume Group Definition, and press Enter.