[linux-lvm] has anyone used LVM in a HA cluster?
caulfield at sistina.com
Fri May 10 02:24:02 UTC 2002
On Thu, May 09, 2002 at 09:54:40AM -0700, Au, Richard wrote:
> I'm wondering if anyone has used LVM in a high-availibility cluster
> where two servers are connected to shared storage (the physical
> volumes). If so, which cluster solution did you use? Will there be
> problems if the logical volumes are visable to both servers, even if
> only one of them has them mounted? Thanks!
Provided you're either using GFS as the file system or being VERY careful to
mount the filesystem on only one node at a time you can do this.
The key is just to be VERY careful. If you need to do any LVM commands you MUST
umount filesystems on all other nodes
vgchange -an on all other nodes
do the LVM metadata changes
vgscan on all nodes
vgchange -ay on all nodes.
The safe thing to do is to have only one node have the LVM commands available to
it (apart from vgscan & vgchange) and be VERY careful.
I'll say that again: Be VERY careful !
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