linux-kernel - Re: XFS internal error xfs_da_do_buf(1) at line 2015 of file fs/xfs/xfs_da

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Date:	Sun, 4 Jan 2009 11:44:25 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Adam Nielsen <a.nielsen@...kadi.net>,
	Christoph Hellwig <hch@...radead.org>,
	LKML Mailinglist <linux-kernel@...r.kernel.org>
Subject: Re: XFS internal error xfs_da_do_buf(1) at line 2015 of file
 fs/xfs/xfs_da_btree.c

> On Debian based systems you can add -W0 to /etc/default/hdparm and
> it gets executed before the root filesystem is remounted read-write,
> I'm not sure how other distributions handle it.

Generally they avoid setting -W0 because it ruins performance and can be
very bad for disk lifetime. The barriers code is there for a reason.

Of course certain distributions default to using LVM for all their file
systems which is completely and mindbogglingly bogus. That both messes up
barriers in some cases and takes a good 10-20% off performance when I've
benched it.

LVM is cool - if you need it, most people don't.

Alan
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