Re: [linux-lvm] Volume Groups and Clusters

[Jeff Hardy <hardyjm potsdam edu>]

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?

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!"
>