Installation guide

Appendix C. Upgrading A Red Hat

Cluster from RHEL 4 to RHEL 5

This appendix provides a procedure for upgrading a Red Hat cluster from RHEL 4 to RHEL 5.

The procedure includes changes required for Red Hat GFS and CLVM, also. For more informa-

tion about Red Hat GFS, refer to Global File System: Configuration and Administration. For

more information about LVM for clusters, refer to LVM Administrator's Guide: Configuration and

Administration.

Upgrading a Red Hat Cluster from RHEL 4 to RHEL 5 consists of stopping the cluster, convert-

ing the configuration from a GULM cluster to a CMAN cluster (only for clusters configured with

the GULM cluster manager/lock manager), adding node IDs, and updating RHEL and cluster

software. To upgrade a Red Hat Cluster from RHEL 4 to RHEL 5, follow these steps:

1. Stop client access to cluster high-availability services.

2. At each cluster node, stop the cluster software as follows:

a. Stop all high-availability services.

b. Run service rgmanager stop.

c. Run service gfs stop.

d. Run service clvmd stop.

Note

If clvmd is already stopped, an error message is displayed:

# service clvmd stop

Stopping clvm: [FAILED]

The error message is the expected result when running service clvmd

stop after clvmd has stopped.

e. Depending on the type of cluster manager (either CMAN or GULM), run the following

command or commands:

• CMAN — Run service fenced stop; service cman stop.

• GULM — Run service lock_gulmd stop.

f. Run service ccsd stop.