[linux-lvm] lvcreate goes into deep-sleep while creating an xfs snapshot
Klaus Strebel
klaus.strebel at gmx.net
Thu Jun 9 10:16:57 UTC 2005
Sven Riedel schrieb:
> Hi,
> I'm creating a backup script for a database using lvm snapshots.
> The script ran fine for a few test runs, then I added xfs_freeze -f
> just before the lvcreate command, as per HOWTO recipe. Now
> lvcreate went into deep-sleep and wont wake up:
>
> update:~/bin# ps ax | grep lvcreate
> 25053 pts/2 D<L+ 0:00 lvcreate -s -L 55M -n tables_snap
> /dev/database_vg/tables_lv
>
> Running lvdisplay in a different terminal to see if lvm itself
> is still seeing all LVs results in lvdisplay going into
> deep-sleep mode as well. Doing an strace -p 25053
> doesn't display anything (strace won't catch my interrupts
> either, but according to ps it's in a regular sleep).
>
> dmesg doesn't say anything to this situation.
>
> Is there a known issue with snapshots and xfs_freeze?
> Any way I can gather pertinent debugging info?
>
> I'm running lvm 2.01.04 (package from debian unstable).
The HOWTO is way old, with LVM2 the XFS filesystem is 'frozen'
automaticly on the mount -onouuid,ro ( not quite sure, but probably also
for LVM1 ..., think it's in the XFS code ).
So, forget xfs_freeze. It's freezing your box, not your filesystems.
XFS-Guys: shouldn't xfs_freeze be removed from xfs_cmds? It's doing more
harm than use ( if any use at all ), so ...
--
Mit freundlichen Grüssen / best regards
Klaus Strebel, Dipl.-Inform. (FH), mailto:klaus.strebel at gmx.net
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