Paul Dugas wrote:
I apologize if this has been covered already or is written up elsewhere
but I can't seem to find it. I've got a couple of AoE volumes that I'm
using for LVM VGs. They have GFS filesystems on LVs that are sized to
fill 90% of the the VGs; 10% space left over for snapshots. I have 4
CENTOS 5.2 machines clustered and mounting the GFS filesystems. That's
working well.
Having used LVM snapshots in non-cluster environments before, I figured
I'd just use the same logic for backing up the volumes; lvcreate -s,
mount, backup, umount, lvremove. This quickly fell apart and I started
to think about it more. I ended up wondering how snapshots of the
volume could ever really work without coordinating with the other
nodes.
My question is this. Should I be able to use snapshots on clustered
volumes like this? If not, are there plans to support it later? If so,
can someone point me to a working example?
I think you have to freeze the GFS volume before you create a snapshot,
then you unfreeze it. man gfs_tool
Vu
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