[Linux-cluster] GFS resource

Dirk H. Schulz dirk.schulz at kinzesberg.de
Sat Jan 23 10:06:19 UTC 2010

Paras pradhan schrieb:
> Hi,
> I have a 3 nodes cluster with shared GFS2 partition connected through 
> SAN. This is Xen virtualization cluster and fencing is working 
> properly. So when there is a problem in any nodes, the node is being 
> fenced and other nodes are working properly. Now my question is do I 
> need to add a GFS resource in this cluster.  If yes why?
I am thinking about the same question. I guess it depends if you have 
CLVM "below" your GFS2 partitions. If yes, clvmd must be running before 
the GFS2 partitions can be mounted (you cannot mount them via fstab at 
system startup then), which means that you have to have them defined as 
resource to get the dependency configured.

If you have setup GFS2 directly on the SAN LUNs I cannot say from 
experience, but from my understanding it's the same situation, since GFS 
uses dlm for locking (but wasn't there an option to use something else?).

In my personal opinion (that is why I am thinking about it in the first 
place) it is a question of clear design. If you have EVERYTHING your 
cluster services need defined as a resource you have a straightforward 
design that
- is easily understood
- is easily documented
- is easily remembered over some years
and all that leads to much easier and less error prone handling in 
emergency situations.

> Thanks!
> Paras.
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