From: Theodore Tso <tytso@MIT.EDU>
To: Andreas Sundstrom <sunkan@zappa.cx>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.28 ext4, xen and lvm volume becomes ro after snapshot
Date: Fri, 26 Dec 2008 13:21:45 -0500 [thread overview]
Message-ID: <20081226182145.GP9871@mit.edu> (raw)
In-Reply-To: <4954FB62.4090306@zappa.cx>
Hmm... ok, to summarize, you are seeing this problem with 2.6.28 (have
you tried earlier kernel versions) when an LVM volume has a read/only
snapshot in existence and you try to mount the LVM volume using ext4.
If you mount the same LVM volume using ext3, you don't see any
problems. Is that correct?
Can you try mounting ext3 with barriers enabled? Booting with the
command linux option rootflags=barriers should do the trick. If that
fails, then it would indicate that trying to enable barriers in a Xen
guest while the host OS has created a snapshot of volume causes an I/O
error, thus leading errors which you are seeing.
- Ted
next prev parent reply other threads:[~2008-12-26 18:21 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-26 11:06 2.6.28 ext4, xen and lvm volume becomes ro after snapshot Andreas Sundstrom
2008-12-26 14:07 ` Theodore Tso
2008-12-26 15:42 ` Andreas Sundstrom
2008-12-26 18:21 ` Theodore Tso [this message]
2008-12-26 18:48 ` Andreas Sundstrom
2008-12-26 19:33 ` Theodore Tso
2008-12-26 22:00 ` Andreas Sundstrom
2008-12-27 3:06 ` Theodore Tso
2008-12-27 9:19 ` Andreas Sundstrom
2009-01-02 3:11 ` Theodore Tso
2009-01-02 8:29 ` Andreas Sundstrom
2009-01-02 14:10 ` Theodore Tso
2009-01-03 10:25 ` Andreas Sundstrom
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