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Re: [linux-lvm] snapshots and nfs

Kristina Clair wrote:

On Tue, 18 Jan 2005 19:44:49 +0000, Alasdair G Kergon <agk redhat com> wrote:

On Tue, Jan 18, 2005 at 12:36:06PM -0500, Kristina Clair wrote:

so, is there a way to have lvcreate not suspend the volume? I'm using
xfs, so I should be able to freeze the filesystem.

Quick question: you're not running xfs_freeze are you?
If so, try without, as device-mapper does the equivalent of that
internally and xfs can't handle things if it gets run twice.

No, if I run xfs_freeze first, lvcreate hangs when it tries to suspend the volume, so I stopped doing that. Now, if I run lvcreate shortly after the machine is booted, it runs successfully. However, if I try to run the same command the next day, after it's been online and the webservers have had the filesystem mounted, it hangs when trying to suspend the volume.

Is it possible that mounting the NFS mounts on the webservers read-only as a temporary measure while creating the snapshot will help?

So I'm wondering if the problem is that the webservers have the
filesystem mounted and in use (apache is serving pages from it),  I'm
trying to find a way to keep the filesystem mounted over nfs but still
be able to create snapshots, and I was wondering if I could use
xfs_freeze and have lvcreate not try to suspend the volume.


Randall Jones     GST      NASA Goddard Space Flight Center
HPC Visualization Support       http://hpcvis.gsfc.nasa.gov
Scientific Visualization Studio    http://svs.gsfc.nasa.gov
rajones svs gsfc nasa gov      Code 610.3      301-286-2239

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