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Re: XFS write cache flush policy

To: Matthias Schniedermeyer <ms@xxxxxxx>
Subject: Re: XFS write cache flush policy
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Mon, 10 Dec 2012 12:01:41 +1100
Cc: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>, Lin Li <sdeber@xxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20121208195304.GA20044@xxxxxxx>
References: <CAA_rkDfFUmZzT_kMznsTSNVxdfqfmz=bmJ400wdBOzocgP32eA@xxxxxxxxxxxxxx> <20121208192927.GA17875@xxxxxxx> <5955806.tSHc7WOiJd@saturn> <20121208195304.GA20044@xxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Sat, Dec 08, 2012 at 08:53:04PM +0100, Matthias Schniedermeyer wrote:
> On 08.12.2012 20:40, Michael Monnerie wrote:
> > Am Samstag, 8. Dezember 2012, 20:29:27 schrieb Matthias Schniedermeyer:
> > > I have the same problem, several times.
> > 
> > I'd like to chime in here, with a similar issue: I have Linux on my 
> > desktop, xfs is the home partition, 16G RAM. One day my system froze, no 
> > chance to do a buffer flush via SYS-S/U/B, I had to press the reset 
> > button (no power off, just reset). Upon restart, *lots* of files were 
> > gone, destroyed, etc, and my KDE desktop wouldn't work anymore. Luckily 
> > I have backups, and could restore - but this just shouldn't happen, and 
> > it was *much* better with older kernels. What is the problem that 
> > metadata isn't written to disk occasionally? I was on 3.6.6 when that 
> > happened, now on 3.6.8, so very recent.
> Now that you say it, this is what happend one of the other times, 
> luckily i had done a backup just before i rebooted, so after 
> xfs_repair'ing the partition (the only time i had to repair something 
> for as long as i'm using XFS) i had to restore my home-directory from 
> backup to get my desktop in a usable state again.

So the hard lockup caused your filesystem to be corrupted, and after
you ran repair lots of files were missing?


People, please be precise about what happened when reporting
problems. Random "me too" posts with ambiguous information in
them does not help solve problems.


Dave Chinner

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