Managing Serviceguard Eighteenth Edition, September 2010

Using Serviceguard Commands to Add Previously Configured Nodes to a Running Cluster
Use the cmrunnode command to join one or more nodes to an already running cluster.
Any node you add must already be a part of the cluster configuration. The following
example adds node ftsys8 to the cluster that was just started with only nodes ftsys9
and ftsys10. The-v (verbose) option prints out all the messages:
cmrunnode -v ftsys8
By default, cmrunnode will do network validation, making sure the actual network
setup matches the configured network setup. This is the recommended method. If you
have recently checked the network and find the check takes a very long time, you can
use the -w none option to bypass the validation.
Since the node’s cluster is already running, the node joins the cluster. Packages may
be started, depending on the package configuration; see “node_name” (page 289)). If the
node does not find its cluster running, or the node is not part of the cluster configuration,
the command fails.
Removing Nodes from Participation in a Running Cluster
You can use Serviceguard Manager, or Serviceguard commands as shown below, to
remove nodes from active participation in a cluster. This operation halts the cluster
daemon, but it does not modify the cluster configuration. To remove a node from the
cluster configuration permanently, you must recreate the cluster configuration file. See
the next section.
Halting a node is a convenient way of bringing it down for system maintenance while
keeping its packages available on other nodes. After maintenance, the package can be
returned to its primary node. See “Moving a Failover Package ” (page 352).
To return a node to the cluster, use cmrunnode.
NOTE: HP recommends that you remove a node from participation in the cluster (by
running cmhaltnode as shown below, or Halt Node in Serviceguard Manager)
before running the HP-UX shutdown command, especially in cases in which a packaged
application might have trouble during shutdown and not halt cleanly.
Use cmhaltnode to halt one or more nodes in a cluster. The cluster daemon on the
specified node stops, and the node is removed from active participation in the cluster.
To halt a node with a running package, use the -f option. If a package was running
that can be switched to an adoptive node, the switch takes place and the package starts
on the adoptive node. For example, the following command causes the Serviceguard
daemon running on node ftsys9 in the sample configuration to halt and the package
running on ftsys9 to move to an adoptive node The -v (verbose) option prints out
messages:
cmhaltnode -f -v ftsys9
Managing the Cluster and Nodes 343