Serviceguard NFS Toolkit A.11.11.04 and A.11.23.03 Administrator's Guide

Overview of Serviceguard NFS
How the Control and Monitor Scripts Work
Chapter 1 21
Monitoring the NFS Services
The monitor script /etc/cmcluster/nfs/nfs.mon works by periodically
checking the status of NFS services using the rpcinfo command. If any
service fails to respond, the script exits, causing a switch to an adoptive
node. The monitor script provides the ability to monitor the rpc.statd,
rpc.lockd, nfsd, rpc.mountd, rpc.pcnfsd, and nfs.flm processes. You
can monitor any or all of these processes as follows:
• To monitor the rpc.statd, rpc.lockd, and nfsd processes, you must
set the NFS_SERVER variable to 1 in the /etc/rc.config.d/nfsconf
file. If one nfsd process dies or is killed, the package fails over, even
if other nfsd processes are running.
• To monitor the rpc.mountd process, you must set the START_MOUNTD
variable to 1 in the /etc/rc.config.d/nfsconf file. To monitor the
rpc.mountd process, you must start it when the system boots up, not
by inetd.
• To monitor the rpc.pcnfsd process, you must set the PCNFS_SERVER
variable to 1 in the /etc/rc.config.d/nfsconf file.
• To monitor the nfs.flm process, you must enable the File Lock
Migration feature. Monitor this process with the ps command, not
with the rpcinfo command. If you enable the File Lock Migration
feature, ensure that the monitor script name is unique for each
package (for example, nfs1.mon).
NOTE The file name of the NFS_FLM_SCRIPT script must be limited to 13
characters or fewer.
NOTE The nfs.mon script uses rpcinfo calls to check the status of various
processes. If the rpcbind process is not running, the rpcinfo calls time
out after 75 seconds. Because 10 rpcinfo calls are attempted before
failover, it takes approximately 12 minutes to detect the failure. This
problem has been fixed in release versions 11.11.04 and 11.23.03.
The default NFS control script, hanfs.sh, does not invoke the monitor
script. You do not have to run the NFS monitor script to use
Serviceguard NFS. If the NFS package configuration file specifies
B5140-90021.book Page 21 Wednesday, November 17, 2004 10:52 AM