Public bug reported:
we're using LVM snapshots on our storage server to provide data for our live
and staging instances.
there are two mountpoints on the server, one for the origin volume, and one for
the snapshot that are exported using NFS to our live/staging instances
(webserver)
today i noticed, that writes on our staging-webserver don't go to the
snapshot as expected, but are hitting the origin volume, messing up all
of our live data.
i checked the NFS-mounts and -exports and they look perfectly valid (staging
mounts snapshot-mountpoint, live mounts origin-mountpoint)
on the storage-server itself looking at the mountpoints, everything looks
valid, too. i wrote some identifying test-files in each mountpoint in order to
track them. no problem as long, as we look on the NFS-server itself.
but looking in the mountpoints of a NFS-client, it shows that the origin data
was mounted.
i found no way to mount the snapshot again.
i'm not entirely sure, what component causes the problem. since the
mountpoints look valid on the server itself, i would rule out LVM. i
also would rule out the NFS-client, since it should not be able to see
what the server hasn't exported. all clients can see the problem (lucid,
maverick, precise).
i've checked for recent software-upgrades on the NFS-server and found:
Thu, Oct 25 2012 11:07:16 +0000
[INSTALL] linux-image-3.2.0-32-generic:amd64
[UPGRADE] nfs-common:amd64 1:1.2.5-3ubuntu3 -> 1:1.2.5-3ubuntu3.1
[UPGRADE] nfs-kernel-server:amd64 1:1.2.5-3ubuntu3 -> 1:1.2.5-3ubuntu3.1
Fri, Oct 26 2012 09:29:34 +0000
[UPGRADE] linux-generic:amd64 3.2.0.31.34 -> 3.2.0.32.35
[UPGRADE] linux-image-generic:amd64 3.2.0.31.34 -> 3.2.0.32.35
since it was working as expected before thursday (2012-10-25), i downgraded
these packages (and rebooted the older kernel)
this didn't solve the problem.
i can reproduce this behavior using different filesystems on the NFS-
server.
i'll attach verision info in my next post. please comment on what info
you might need to figure this out.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1071733
Title:
NFS export of LVM snapshot exports origin instead of snapshot
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