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RE: [ogfs-users]mount freeze on 3rd machine



On Thu, 2004-06-24 at 16:36, Cahill, Ben M wrote:
> Hi Arnaud,
> 
> There is a known issue with the current support for OpenDLM.  It will
> likely cause problems if you mount more than one OpenGFS filesystem on a
> given node (is this what you mean by "partition"?).  We need to get some
> static variables, used for recovery aspects, placed into an instance
> structure (one instance for each mounted filesystem).  I'm not *sure*
> that this is the root cause of your problem, but it might be.

I think so :-(( Well, Yes I used partition for filesystem, sorry.

> Also, what does "thist" mean?  (Sorry for my ignorance).

Probably "this" typed too fast :-))

> BTW, realize that you're working in untested territory!!  Stan just
> recently wrote the recovery support for using OpenDLM, and we've never
> tried it with more than two nodes.  You are on the "bleeding edge", and
> we thank you for it!  ;-)

Well, I have time for testing, and I am not in a hurry for everything,
But I really need 2 filesystems mounted on 2 machines soon...

> For more output from the OpenGFS OpenDLM lock module, you can load it
> with:
> 
> # modprobe opendlm debug=1

I tried, but it didn't help at all :-((

> That will generate a lot of output, but it may be helpful.  I'm guessing
> that the problem is in the locking, not the main filesystem code.

Yes.

> If you're eager to get going, and could tolerate a
> single-point-of-failure, you could also try the memexp locking
> (HOWTO-nopool).  You can switch back and forth between memexp and
> OpenDLM, if you'd like (requires unmount/mount).  There is no on-disk
> locking data (beyond the name of the default locking protocol, stored in
> the superblock, which you can override in the mount command).

These 2 filesystems are mounted on an HA Cluster, so I don't really want
any SPOF. My idea is to have this cluster managing a CPU farm. Probably
OpenMOSIX. Production estimated date: end of the year... Is ti
realistic?

Regards,
Arnaud
-- 
Arnaud Gauthier <agauthier@xxxxxxxxxxxxx>
Realmedia




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