HP Serviceguard Toolkit for NFS manual Configuring an MC/ServiceGuard NFS Package

Installing and Configuring MC/ServiceGuard NFS

Configuring an MC/ServiceGuard NFS Package

The path name for the executable script does not have to be unique to each package. Every package can use the same script. Multiple instances of the monitor script can run on the same node without any problems, and if a package fails over, only the instance associated with that package is killed.

If you do not want to run the NFS monitor script, comment out the NFS_SERVICE_NAME and NFS_SERVICE_CMD variables:

#NFS_SERVICE_NAME[0]=nfs.monitor

#NFS_SERVICE_CMD[0]=/etc/cmcluster/nfs/nfs.mon

By default, the NFS_SERVICE_NAME and NFS_SERVICE_CMD variables are commented out, and the NFS monitor script is not run.

7.If two packages have the same adoptive node, and you want to prevent the adoptive node from adopting both packages at once, specify the cmmodpkg command with the package control option (-d) in the customer_defined_run_cmds.

function customer_defined_run_cmds

{

cmmodpkg -d -n ‘hostname‘ pkg02 &

}

The package control option can prevent an adoptive node from becoming overloaded when multiple packages fail over. If an adoptive node becomes overloaded, it can fail.

In this example, if a host is an adoptive node for both pkg01 and pkg02, the above cmmodpkg -dcommand, in the control script for pkg01, would prevent the host that is running pkg01 from adopting pkg02. A similar line in the control script for pkg02 could prevent the host that is running pkg02 from adopting pkg01. The ampersand (&) causes the cmmodpkg command to run in the background. It must run in the background to allow the control script to finish bringing up the package. The cmmodpkg command will hang until the package is up, so it must run in the background to allow the control script to complete.

There is a short time, after one package has failed over but before the cmmodpkg command has executed, when the other package can fail over and the host will adopt it. In other words, if two packages fail over at approximately the same time, a host may adopt both packages, even though the package control option is specified.

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