Testing The Nfs Cluster Service - Red Hat ENTERPRISE LINUX 5 - CONFIGURATION NFS OVER GFS Configuration Manual

Chapter 6.

Testing the NFS Cluster Service

After you have configured the NFS service, you can check to be sure that the NFS service is working
and that it will continue to work as expected if one of the nodes goes down. The following procedure
tests an NFS mount on a client, fences the node on which the NFS service is running, and then
checks to be sure that the NFS client can still access the file system.
1. If the GFS file system in the nfsclust cluster is currently empty, populate the file system with
test data.
2. Log in to one of the client systems you defined as a target.
3. Mount the NFS file system on the client system, and check to see if the data on that file system as
available.
4. On the Luci server, select Nodes from the menu for nfsclust. This displays the nodes in
nfsclust and indicates which node is running the nfssvc service.
5. The drop-down box for each node displays Choose a task. For the node on which the nfssvc
service is running, select Fence this node.
6. Refresh the screen. The nfssvc service should now be running in a different node.
7. On the client system, check whether the file system you mounted is still available. Even though the
NFS service is now running on a different node in the cluster, the client system should detect no
difference.
8. Restore the system to its previous state:
• Unmount the file system from the client system.
• Delete any test data you created in the GFS file system.
• Click on Choose a task in the drop-down box for the node which you fenced and select Reboot
this node.
Note
For advanced troubleshooting once a system has gone into production, it is sometimes
necessary to set up the netconsole and kdump services on a system. You may find it
useful to implement and test these tools before a system goes into production, to help in
troubleshooting down the line.
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