[linux-lvm] snapshots and nfs
Randall A. Jones
rajones at svs.gsfc.nasa.gov
Tue Jan 18 20:07:04 UTC 2005
Kristina Clair wrote:
>On Tue, 18 Jan 2005 19:44:49 +0000, Alasdair G Kergon <agk at 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 at svs.gsfc.nasa.gov Code 610.3 301-286-2239
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