[Linux-cluster] is clvm a must all the time in a cluster ?

[Jonathan Brassow]

 From the description, I am skeptical that clvm is your problem...   
(Also, are you using a proper fencing mechanism?)

We would probably need more information from the logs to determine  
what is going on.

  brassow

On Feb 25, 2008, at 3:06 PM, Roger Peña wrote:

> Hi
>
> I am running RHEL4 with csgfs from centos, all
> packages updates in both sets (RHEL and CS-GFS)
> but since the last updates my cluster become more
> unstable, sometimes after a failed shutdown of a
> service (it failed because was unable to umount the
> GFS) and the other two times just dont know exactly
> why (I wasn't ther when it happen, just went to
> fixed).
> all of this in lest than two weeks
> and every time, the cman infrastructure just hand or
> collapse.
> the first to times, I realice that one of the nodes
> (and just one) was hanging the cman so the entire
> cluster where in stand-by, until I fence (reboot) the
> node.
> from cman_tool services in that node, I guess clvm was
> the guilty just because it were running (run state):-)
> it shouldn't be in that state ;-) . it is just a
> guess, ok? I am not an expert in CS.
> also, a lot, and I mean a lot, of time my services
> can't start is because the clustered LV are not
> Activated even when clvm is running and cman_tool
> services say it is running.
> just a clvmd restar fix that.
>
> so, my question is, can I run the cluster with GFS
> without clvmd working?
> I don't have plans to work with lvm (extending for
> example) the sistem is working and should be in the
> same state (from the filesystem point of view) for a
> long time.
> so, can I "declusterice" the LV where GFS live?
>
> and if I can, what are the steps to do it?
>
> 1- vgchange -cn "VG Name"
> 2- cmand stop
> 3- lvmconf --disable-cluster
>
> I guess I don't need to unmount the LV to do that, do
> I?
> nore the data in those FS should be lost because of
> that operation (tha change), right?
>
>
> thanks in advance for the help
>
> cu
> roger
>
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