Using Serviceguard Extension for RAC, 9th Edition, September 2010

Primary up enabled manx
Alternate up enabled burmese
Alternate up enabled tabby
Alternate up enabled persian
Online Reconfiguration
The online reconfiguration feature provides a method to make configuration changes online to
a Serviceguard Extension for RAC (SGeRAC) cluster. Specifically, this provides the ability to
add and/or delete nodes from a running SGeRAC Cluster, and to reconfigure SLVM Volume
Group (VG) while it is being accessed by only one node.
Online Node Addition and Deletion
Online node addition enables the addition or deletion of nodes in a SGeRAC cluster to or from
another running cluster. Node(s) can be added and/or deleted by changing the cluster
configuration. This is done by editing the cluster specification file and re-applying the
configuration to the already running cluster. For deleting online node(s), the node(s) needs to
be halted before deleting them from the cluster.
Use the following steps for adding a node using online node reconfiguration:
1. Export the mapfile for the volume groups that needs to be visible in the new node ( vgexport
-s -m mapfile -p <sharedvg>).
2. Copy the mapfile to the new node.
3. Import the volume groups into the new node (vgimport -s -m mapfile <sharedvg>).
4. Add node to the cluster online—edit the cluster configuration file to add the node details
and run cmapplyconf.
5. Make the new node join the cluster (cmrunnode) and run the services.
Use the following steps for deleting a node using online node reconfiguration:
1. Halt the node in the cluster by running cmhaltnode.
2. Edit the cluster configuration file to delete a node(s).
3. Run cmapplyconf.
Managing the Shared Storage
The following describes the confirmation process for Single Node Online volume
Re-Configuration, in addition to procedures for configuring LVM version 1.0. There are differences
between LVM version 1 and version 2.
NOTE: When using LVM, the volume groups are supported with Serviceguard.
For more information on using and configuring LVM version 2.x, see the HP-UX 11i Version 3:
HP-UX System Administrator's Guide: Logical Volume Management located at
www.hp.com/go/hpux-core-docs—> HP-UX 11iv3.
For LVM version 2 compatibility requirements, see the Serviceguard/SGeRAC/SMS/Serviceguard
Mgr Plug-in Compatibility and Feature Matrix at www.hp.com/go/hpux-serviceguard-docs
—> HP Serviceguard.
NOTE: For more information, see the Serviceguard Version A.11.20 Release Notes at
www.hp.com/go/hpux-serviceguard-docs —> HP Serviceguard.
Making LVM Volume Groups Shareable
Normally, volume groups are marked to be activated in “shared” mode when they are listed
with the OPS_VOLUME_GROUP parameter in the cluster configuration file or in Serviceguard
118 Maintenance and Troubleshooting