Using Serviceguard Extension for RAC, 6th Edition, April 2008

NOTE: Use care in defining service run commands. Each run command is executed
by the control script in the following way:
• The cmrunserv command executes each run command and then monitors the
process id of the process created by the run command.
• When the command started by cmrunserv exits, Serviceguard determines that a
failure has occurred and takes appropriate action, which may include transferring
the package to an adoptive node.
• If a run command is a shell script that runs some other command and then exits,
Serviceguard will consider this normal exit as a failure.
To avoid problems in the execution of control scripts, ensure that each run command
is the name of an actual service and that its process remains alive until the actual service
stops.
If you need to define a set of run and halt operations in addition to the defaults, create
functions for them in the sections under the heading CUSTOMER DEFINED FUNCTIONS.
Optimizing for Large Numbers of Storage Units
A set of four variables is provided to allow performance improvement when employing
a large number of filesystems or storage groups. For more detail, see the comments in
the control script template. They are:
• CONCURRENT_VGCHANGE_OPERATIONS—defines a number of parallel LVM
volume group activations during package startup as well and deactivations during
package shutdown.
• CONCURRENT_FSCK_OPERATIONS—defines a number of parallel fsck operations
that will be carried out at package startup.
• CONCURRENT_MOUNT_AND_UMOUNT_OPERATIONS—defines a number of parallel
mount operations during package startup and unmount operations during package
shutdown.
Customizing the Control Script for RAC Instances
Use the package control script to perform the following:
• Activation and deactivation of RAC volume groups.
• Startup and shutdown of the RAC instance.
• Monitoring of the RAC instance.
Set RAC environment variables in the package control script to define the correct
execution environment for RAC.
Enter the names of the LVM volume groups you wish to activate in shared mode in
the VG[] array. Use a different array element for each RAC volume group. (Remember
that RAC volume groups must also be coded in the cluster configuration file using
134 Serviceguard Configuration for Oracle 9i RAC