Re: [linux-lvm] Volume Groups and Clusters

[Heinz Mauelshagen <mauelshagen@redhat.com>]

On Fri, Feb 24, 2006 at 02:22:08PM -0500, Jeff Hardy wrote:
> I played around with this kind of setup for awhile, and found that there
> was no need to vgchange -an on the "Other nodes" when I was making
> changes on the "Admin node."  I was also able to make volume changes on
> two Admin nodes at the same time.  I figured I was probably just
> extremely lucky to win some extremely dangerous race conditions, so I
> wouldn't do it in production.  I assume the cluster extensions to LVM
> (CLVM) are what allow multiple Admin actions on multiple Admin nodes?

Yes.

Heinz

> 
> Anyway, just some friendly advice: follow the docs :)
> 
> 
> On Wed, 2006-02-22 at 08:27 -0500, Joshua ChaitinPollak wrote:
> > On Feb 22, 2006, at 8:12 AM, Patrick Caulfield wrote:
> > 
> > > Joshua ChaitinPollak wrote:
> > >>
> > >> On Feb 22, 2006, at 3:49 AM, Heinz Mauelshagen wrote:
> > >>
> > >>> On Tue, Feb 21, 2006 at 04:22:10PM -0500, Joshua ChaitinPollak  
> > >>> wrote:
> > >>>> Hello, I found this mention of sharing Volume Groups across  
> > >>>> Clusters
> > >>>> on the LVM howto:
> > >>>>
> > >>>> http://www.tldp.org/HOWTO/LVM-HOWTO/sharinglvm1.html
> > >>>>
> > >>>> Am I right in assuming that this means you can have a single volume
> > >>>> group active on multiple nodes in a cluster, provided that you  
> > >>>> doing
> > >>>> mount the same logical volume on more than one node at a time?
> > >>>
> > >>> Yes, you assume right *but* you need a cluster filesystem (eg, GFS)
> > >>> as well to be able to mount shared logical volumes on multiple nodes
> > >>> at once or you mess up the data.
> > >>
> > >> Right, but I don't need GFS if I'm only going to mount the file  
> > >> system
> > >> on one machine at a time, right?
> > >
> > > No, just a lot of care and discipline :)
> > 
> > Great! And, my co-workers keep telling me, "You lack discipline!"
> > 
> 
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Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
Cluster and Storage Development                   56242 Marienrachdorf
                                                  Germany
Mauelshagen@RedHat.com                            +49 2626 141200
                                                       FAX 924446
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