linux-kernel - Re: [linux-lvm] 2.6.22-rc4 XFS fails after hibernate/resume

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Date:	Mon, 18 Jun 2007 08:49:34 +0100
From:	David Greaves <david@...eaves.com>
To:	David Robinson <zxvdr.au@...il.com>
Cc:	LVM general discussion and development <linux-lvm@...hat.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	xfs@....sgi.com, linux-pm <linux-pm@...ts.osdl.org>,
	LinuxRaid <linux-raid@...r.kernel.org>
Subject: Re: [linux-lvm] 2.6.22-rc4 XFS fails after hibernate/resume

David Greaves wrote:
> David Robinson wrote:
>> David Greaves wrote:
>>> This isn't a regression.
>>>
>>> I was seeing these problems on 2.6.21 (but 22 was in -rc so I waited 
>>> to try it).
>>> I tried 2.6.22-rc4 (with Tejun's patches) to see if it had improved - 
>>> no.
>>>
>>> Note this is a different (desktop) machine to that involved my recent 
>>> bugs.
>>>
>>> The machine will work for days (continually powered up) without a 
>>> problem and then exhibits a filesystem failure within minutes of a 
>>> resume.

<snip>

> OK, that gave me an idea.
> 
> Freeze the filesystem
> md5sum the lvm
> hibernate
> resume
> md5sum the lvm
<snip>
> So the lvm and below looks OK...
> 
> I'll see how it behaves now the filesystem has been frozen/thawed over 
> the hibernate...


And it appears to behave well. (A few hours compile/clean cycling kernel builds 
on that filesystem were OK).


Historically I've done:
sync
echo platform > /sys/power/disk
echo disk > /sys/power/state
# resume

and had filesystem corruption (only on this machine, my other hibernating xfs 
machines don't have this problem)

So doing:
xfs_freeze -f /scratch
sync
echo platform > /sys/power/disk
echo disk > /sys/power/state
# resume
xfs_freeze -u /scratch

Works (for now - more usage testing tonight)

David
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