From owner-freebsd-fs@FreeBSD.ORG  Wed Jan 11 15:01:36 2012
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 90F961065672
	for <freebsd-fs@freebsd.org>; Wed, 11 Jan 2012 15:01:36 +0000 (UTC)
	(envelope-from phoemix@harmless.hu)
Received: from marvin.harmless.hu (marvin.harmless.hu [195.56.55.204])
	by mx1.freebsd.org (Postfix) with ESMTP id 55E1A8FC14
	for <freebsd-fs@freebsd.org>; Wed, 11 Jan 2012 15:01:36 +0000 (UTC)
Received: from gprs4f7a1e2d.pool.t-umts.hu ([79.122.30.45] helo=unknown)
	by marvin.harmless.hu with esmtpsa (TLSv1:AES128-SHA:128)
	(Exim 4.75 (FreeBSD)) (envelope-from <phoemix@harmless.hu>)
	id 1RkzSZ-000K8a-6U
	for freebsd-fs@freebsd.org; Wed, 11 Jan 2012 15:47:28 +0100
Date: Wed, 11 Jan 2012 15:47:22 +0100
From: Gergely CZUCZY <phoemix@harmless.hu>
To: freebsd-fs@freebsd.org
Message-ID: <20120111154722.000036e4@unknown>
Organization: Harmless Digital
X-Mailer: Claws Mail 3.7.6 (GTK+ 2.16.0; i586-pc-mingw32msvc)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Subject: Unplugging disk under ZFS yield panic
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 11 Jan 2012 15:01:36 -0000

Dear List,

I'd like to ask, whether it is normal behaviour when we're unplugging a
disk under a ZFS system then on the first write a kernel panic happened.

The hardware is a supermicro X8DTH-i/6/iF/6F board with 2x LSI 2008
fusion MPT SAS-2 controllers, over the mps(4) driver. The disks are
accessed over gmultipath, and the multipath'd devices are added to a
ZFS mirror:
DB
 mirror-0
  multipath/DB01
  multipath/DB02
 mirror-1
  multipath/DB03
  multipath/DB04
 logs
  mirror/host1p5
 cache
  multipath/SSD03p1
 spares
  multipath/DB05

System is 9.0-RELEASE

I've unplugged DB03 and on the first write we got a kernel panic.
Should this be normal behaviour or we're missing something here?

On a device removal we're expecting it to moving to the spare disk, or
using the available redundant disks.

Best regards,
Gergely