From owner-freebsd-geom@FreeBSD.ORG  Mon Nov 29 11:57:22 2004
Return-Path: <owner-freebsd-geom@FreeBSD.ORG>
Delivered-To: freebsd-geom@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 2C24616A4CE
	for <freebsd-geom@freebsd.org>; Mon, 29 Nov 2004 11:57:22 +0000 (GMT)
Received: from zaphod.nitro.dk (port324.ds1-khk.adsl.cybercity.dk
	[212.242.113.79])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 8EEFA43D55
	for <freebsd-geom@freebsd.org>; Mon, 29 Nov 2004 11:57:19 +0000 (GMT)
	(envelope-from simon@zaphod.nitro.dk)
Received: by zaphod.nitro.dk (Postfix, from userid 3000)
	id E616911A6B; Mon, 29 Nov 2004 12:57:17 +0100 (CET)
Date: Mon, 29 Nov 2004 12:57:17 +0100
From: "Simon L. Nielsen" <simon@FreeBSD.org>
To: Terje Elde <terje+geom@elde.net>
Message-ID: <20041129115717.GA753@zaphod.nitro.dk>
References: <20041129114740.GD90910@calleigh.elde.net>
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="CE+1k2dSO48ffgeK"
Content-Disposition: inline
In-Reply-To: <20041129114740.GD90910@calleigh.elde.net>
User-Agent: Mutt/1.5.6i
cc: freebsd-geom@freebsd.org
Subject: Re: mirror handling of broken harddrives
X-BeenThere: freebsd-geom@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: GEOM-specific discussions and implementations
	<freebsd-geom.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-geom>,
	<mailto:freebsd-geom-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-geom>
List-Post: <mailto:freebsd-geom@freebsd.org>
List-Help: <mailto:freebsd-geom-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-geom>,
	<mailto:freebsd-geom-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 29 Nov 2004 11:57:22 -0000


--CE+1k2dSO48ffgeK
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On 2004.11.29 12:47:40 +0100, Terje Elde wrote:

> Given faulty hardware, resulting in:
>=20
> ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=3D35170616
> ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=3D35170616
> ad0: FAILURE - READ_DMA timed out
>=20
> How would this be handled by geom_mirror if it was a part of a two-plex
> volume?

I can show you from my log how it handles it :-) :

ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=3D152911
ad0: FAILURE - WRITE_DMA timed out
GEOM_MIRROR: Request failed (error=3D5). ad0[WRITE(offset=3D78290432, lengt=
h=3D16384)]
GEOM_MIRROR: Device boot: provider ad0 disconnected.
GEOM_MIRROR: Device boot: provider ad0 detected.
GEOM_MIRROR: Device boot: rebuilding provider ad0.
GEOM_MIRROR: Device boot: rebuilding provider ad0 finished.
GEOM_MIRROR: Device boot: provider ad0 activated.

So, it just works :-).

Actually the mirror in question has rebuild itself like that many
times, and I actually only noticed after quite a while :-).

I actually had more or less the same (the ata errors) happen on
another system, which uses ata(4) for RAID1, and there I had to
manually rebuild the mirror...

geom_mirror has just worked great for me, thanks Pawel! :-)

--=20
Simon L. Nielsen

--CE+1k2dSO48ffgeK
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.6 (FreeBSD)

iD8DBQFBqw6dh9pcDSc1mlERAorBAJ97A9ysQBAoaCTPOTMoG5dPWY9Y+wCfYmk7
SwdeBoAMnwGBvl7FAiP+LzI=
=t4eM
-----END PGP SIGNATURE-----

--CE+1k2dSO48ffgeK--