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Date: Thu, 09 Jun 2005 12:16:57 +0200
From: Klaus Strebel <klaus.strebel@gmx.net>
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Subject: Re: [linux-lvm] lvcreate goes into deep-sleep while creating an xfs
	snapshot
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To: LVM general discussion and development <linux-lvm@redhat.com>, linux-xfs@oss.sgi.com

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=20
> just before the lvcreate command, as per HOWTO recipe. Now
> lvcreate went into deep-sleep and wont wake up:
>=20
> update:~/bin# ps ax | grep lvcreate
> 25053 pts/2    D<L+   0:00 lvcreate -s -L 55M -n tables_snap=20
>    /dev/database_vg/tables_lv
>=20
> Running lvdisplay in a different terminal to see if lvm itself
> is still seeing all LVs results in lvdisplay going into=20
> deep-sleep mode as well. Doing an strace -p 25053=20
> doesn't display anything (strace won't catch my interrupts
> either, but according to ps it's in a regular sleep).
>=20
> dmesg doesn't say anything to this situation.
>=20
> Is there a known issue with snapshots and xfs_freeze?=20
> Any way I can gather pertinent debugging info?
>=20
> I'm running lvm 2.01.04 (package from debian unstable).

The HOWTO is way old, with LVM2 the XFS filesystem is 'frozen'=20
automaticly on the mount -onouuid,ro ( not quite sure, but probably also=20
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=20
harm than use ( if any use at all ), so ...
--=20
Mit freundlichen Gr=EF=BF=BDssen / best regards

Klaus Strebel, Dipl.-Inform. (FH), mailto:klaus.strebel@gmx.net

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