From: Stuart D Gathman <stuart@bmsi.com>
To: linux-lvm@redhat.com
Subject: Re: [linux-lvm] Errors from a mirrored LV
Date: Sun, 12 Sep 2010 21:50:44 -0400 [thread overview]
Message-ID: <4C8D8374.6040706@bmsi.com> (raw)
In-Reply-To: <1284181378.3968.14.camel@pc7.dolda2000.com>
On 09/11/2010 01:02 AM, Fredrik Tolf wrote:
> Having a disk that's going awry, I'm glad I've got the data in a
> mirrored LV so that I can replace it.
>
> sd 3:0:0:0: [sdd] Add. Sense: Unrecovered read error - auto reallocate
> failed
> end_request: I/O error, dev sdd, sector 662969514
> ata4: EH complete
> I/O error in filesystem ("dm-3") meta-data dev dm-3 block 0x27841ae8
> ("xfs_trans_read_buf") error 5 buf count 4096
>
> Note that last line of log, emitted by XFS.
>
> Shouldn't LVM, when a read fails in a mirror, try to fetch that data
> from the second disk instead?
>
Correct me if I'm wrong, but LVM mirror support is still experimental
and doesn't do a lot of things. If you need reliable mirroring now, use
the md driver for raid1, and add the /dev/md* devices as physical volumes.
In the meantime, you should probably remove the failing PV.
AIX is still the best LVM mirroring I've seen. I know ZFS is great too,
but it is more tied to a specific filesystem.
prev parent reply other threads:[~2010-09-13 1:50 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-11 5:02 [linux-lvm] Errors from a mirrored LV Fredrik Tolf
2010-09-13 1:50 ` Stuart D Gathman [this message]
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