topic Re: Mount CFS filesystem in single node in Operating System - HP-UX

Mount CFS filesystem in single node

Ivan Rodriguez Sanchez — Wed, 02 Mar 2011 09:21:38 GMT

Hi team!

A client asked me the following question:

If I have a contingent single node for a CFS cluster, could I with the cluster down mount this filesystem at the single node?

I read that there is a procedure
to do this, bringing down the cluster, deporting the disk group at the master node, importing the disk group without the shareable flag at the single node, and mount the filesystem with 'mount' command.

Is this prodecure right?
Is it supported?
Is it supported after doing this, to mount the filesystem again in the cluster as CFS?

Thanks!!!

Re: Mount CFS filesystem in single node

Stephen Doud — Wed, 02 Mar 2011 13:05:02 GMT

The basic steps you outline to make a CFS DG/file system available should work.
However to bring the disk group back into CFS usage, it must be deported again and imported with the -C -s option, but that cannot be done unless the CVM (started by SG-CFS-pkg) is running to authorize it. That means that you have to start the cluster (and with it, SG-CFS-pkg). Doing so will cause SG to start the multi-node packages that awaken the DG packages and mount the file systems. The DG and MP packages will fail until you have imported the DG and manually start the packages on all nodes (for eg. cfsdgadm activate shared_disk_group [node_name ...], and cfsmount mount_point [node_name ...]

Re: Mount CFS filesystem in single node

Ivan Rodriguez Sanchez — Wed, 02 Mar 2011 13:08:02 GMT

Hi Stephen,

Thanks a lot for your response.
So, to close the thread,do you know if this procedure is supported?

Re: Mount CFS filesystem in single node

Stephen Doud — Wed, 02 Mar 2011 13:20:11 GMT

Please re-read my first thread - I changed the package restart commands at the end.
The term "supported" essentially means "The HP Lab has tested the procedure and determined that it is safe and workable and HP will provide assistance if it does not work".
No lab has the bandwidth to test every potentiality or procedure and in this case, the lab has not considered your contingency plan, so HP would not "support" it even though it will probably work. (For your info, I have deleted and recreated CFS clusters, maintaining data integrity through the process). But any admin would test their procedure before putting it into operation - right?

Re: Mount CFS filesystem in single node

Ivan Rodriguez Sanchez — Wed, 02 Mar 2011 13:25:27 GMT

OK Stephen, everything is clear now.

Thanks for you help.
I'll close the thread.

Re: Mount CFS filesystem in single node

Ivan Rodriguez Sanchez — Wed, 02 Mar 2011 13:25:55 GMT

Thread closed