Continentalclusters Version A.07.00 Release Notes, December 2007 (T2346-90010)

Continentalclusters Version A.07.00 Release Notes
Known Problems and Workarounds
Chapter 1 21
Persistent “cmomd” Processes
• What is the problem?
If the node where the monitor process (cmclsentryd) is running goes
down and then comes back up (as in a power failure), the cmomd
process will remain on one or more nodes in the cluster that is being
monitored. In these circumstances, the cmomd process will continue
on the system until terminated by a user. This can become a
significant problem if a monitoring node is powered off and on
several times, leaving several cmomd processes on the monitored
cluster, using system process table space as well as other system
resources.
• What is the workaround?
After a failure of the monitoring node, kill the unused cmomd
processes.
Provider File Renaming
• What is the problem?
If the provider file, which is named
/opt/cmom/providers/cmprovider.omp by default, is copied to a
backup file by adding a prefix to the name (for example,
bk_cmprovider.omp), then Serviceguard will not be able to tell
which file is the correct one.
• What is the workaround?
Do not rename the provider file to a different name by adding a
prefix. As an alternative, store copies or alternate versions of the file
in a different directory.
Applications hang when all PV links are down
• What is the problem?
When all PV links to a disk array used by a primary or recovery
package are down, the package applications accessing that array will
hang indefinitely. The applications will not detect an error and
cannot be killed. Even running cmhaltpkg will not stop the
application.
• What is the workaround?