Message-ID: <49607B5B.3070707@shikadi.net>
Date: Sun, 04 Jan 2009 19:03:23 +1000
From: Adam Nielsen <a.nielsen@shikadi.net>
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To: Christoph Hellwig <hch@infradead.org>
CC: LKML Mailinglist <linux-kernel@vger.kernel.org>
Subject: Re: XFS internal error xfs_da_do_buf(1) at line 2015 of file fs/xfs/xfs_da_btree.c
References: <49600DE6.2080108@shikadi.net> <20090104074659.GA16775@infradead.org>
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> This is a typical result of a power loss scenario with write caches
> enabled and without barriers.  Given that md can't pass through barriers
> did you disable the write caches on your disk?

No, I didn't realise I had to do that...in fact I didn't even realise SATA 
disks *had* write caches, I thought the cache was for reading only...

> Run xfs_repair over it to fix up the directory, and make sure to
> configure your disks properly so that it doesn't happen again..

Will do, thanks for the advice!  Is there any standard way to disable write 
caching on a SATA disk?  hdparm -W seems to do the trick, but then I can't run 
that until the system is up and running, leaving a small window of opportunity 
for something to go wrong.

Thanks again,
Adam.

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