Managing Serviceguard Eighteenth Edition, September 2010

After it halts, run the package on the new node using the cmrunpkg command, then
re-enable switching as described under “Using Serviceguard Commands to Start a
Package” (page 351).
Changing Package Switching Behavior
There are two options to consider:
• Whether the package can switch (fail over) or not.
• Whether the package can switch to a particular node or not.
For failover packages, if package switching is set to NO the package cannot move to
any other node; if node switching is set to NO, the package cannot move to that particular
node. For multi-node packages, if package switching is set to NO, the package cannot
start on a new node joining the cluster; if node switching is set to NO, the package cannot
start on that node.
Both node switching and package switching can be changed dynamically while the
cluster is running. The initial setting for package switching is determined by the auto_run
parameter, which is set in the package configuration file (page 289). If auto_run is set to
yes, then package switching is enabled when the package first starts. The initial setting
for node switching is to allow switching to all nodes that are configured to run the
package.
You can use Serviceguard Manager to change package switching behavior, or
Serviceguard commands as shown below.
Changing Package Switching with Serviceguard Commands
You can change package switching behavior either temporarily or permanently using
Serviceguard commands. To temporarily disable switching to other nodes for a running
package, use the cmmodpkg command. For example, if pkg1 is currently running, and
you want to prevent it from starting up on another node, enter the following:
cmmodpkg -d pkg1
This does not halt the package, but will prevent it from starting up elsewhere.
You can disable package switching to particular nodes by using the -n option of the
cmmodpkg command. The following prevents pkg1 from switching to node lptest3:
cmmodpkg -d -n lptest3 pkg1
To permanently disable switching so that the next time the cluster restarts, the change
you made in package switching is still in effect, change the auto_run flag in the package
configuration file, then re-apply the configuration. (See “Reconfiguring a Package on
a Running Cluster ” (page 386).)
Maintaining a Package: Maintenance Mode
Serviceguard A.11.20 provides two ways to perform maintenance on components of a
modular, failover package while the package is running. (See Chapter 6 (page 279) for
Managing Packages and Services 353