Managing Serviceguard Nineteenth Edition, Reprinted June 2011

Adding Nodes to the Cluster While the Cluster is Running
You can use Serviceguard Manager to add nodes to a running cluster, or use Serviceguard
commands as in the example below.
In this example, nodes ftsys8 and ftsys9 are already configured in a running cluster named
cluster1, and you are adding node ftsys10.
1. Use the following command to store a current copy of the existing cluster configuration in a
temporary file:
cmgetconf -c cluster1 temp.ascii
2. Specify a new set of nodes to be configured and generate a template of the new configuration.
Specify the node name (39 bytes or less) without its full domain name; for example, ftsys8
rather than ftsys8.cup.hp.com. Enter a command such as the following (all on one line):
cmquerycl -C clconfig.ascii -c cluster1 -n ftsys8 -n ftsys9 -n
ftsys10
3. Open clconfig.ascii in an editor and check that the information about the new node is
what you want.
4. Verify the new configuration:
cmcheckconf -C clconfig.ascii
5. Apply the changes to the configuration and distribute the new binary configuration file to all
cluster nodes:
cmapplyconf -C clconfig.ascii
Use cmrunnode to start the new node, and, if you so decide, set the AUTOSTART_CMCLD
parameter to 1 in the /etc/rc.config.d/cmcluster file to enable the new node to join the
cluster automatically each time it reboots.
NOTE: Before you can add a node to a running cluster that uses Veritas CVM, the node must
already be connected to the disk devices for all CVM disk groups. The disk groups will be available
for import when the node joins the cluster.
Removing Nodes from the Cluster while the Cluster Is Running
You can use Serviceguard Manager to delete nodes, or Serviceguard commands as shown below.
The following restrictions apply:
• The node must be halted. See “Removing Nodes from Participation in a Running Cluster”
(page 266).
• If the node you want to delete is unreachable (disconnected from the LAN, for example), you
can delete the node only if there are no packages which specify the unreachable node. If
there are packages that depend on the unreachable node, halt the cluster or use Serviceguard
commands as described in the next section.
Use the following procedure to delete a node with HP-UX commands. In this example, nodes
ftsys8, ftsys9 and ftsys10 are already configured in a running cluster named cluster1,
and you are deleting node ftsys10.
NOTE: If you want to remove a node from the cluster, run the cmapplyconf command from
another node in the same cluster. If you try to issue the command on the node you want removed,
you will get an error message.
1. Use the following command to store a current copy of the existing cluster configuration in a
temporary file:
cmgetconf -c cluster1 temp.ascii
Reconfiguring a Cluster 283