From owner-freebsd-fs@FreeBSD.ORG Thu Nov 12 12:06:18 2009 Return-Path: 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 ADE0910656A6 for ; Thu, 12 Nov 2009 12:06:18 +0000 (UTC) (envelope-from gerrit@pmp.uni-hannover.de) Received: from mrelay1.uni-hannover.de (mrelay1.uni-hannover.de [130.75.2.106]) by mx1.freebsd.org (Postfix) with ESMTP id 206358FC16 for ; Thu, 12 Nov 2009 12:06:17 +0000 (UTC) Received: from www.pmp.uni-hannover.de (www.pmp.uni-hannover.de [130.75.117.2]) by mrelay1.uni-hannover.de (8.14.2/8.14.2) with ESMTP id nACC6F0C019641; Thu, 12 Nov 2009 13:06:16 +0100 Received: from pmp.uni-hannover.de (arc.pmp.uni-hannover.de [130.75.117.1]) by www.pmp.uni-hannover.de (Postfix) with SMTP id 430124F; Thu, 12 Nov 2009 13:06:15 +0100 (CET) Date: Thu, 12 Nov 2009 13:06:15 +0100 From: Gerrit =?ISO-8859-1?Q?K=FChn?= To: "James R. Van Artsdalen" Message-Id: <20091112130615.64b44914.gerrit@pmp.uni-hannover.de> In-Reply-To: <4AF4AAFF.2080104@jrv.org> References: <20091106094734.4b056899.gerrit@pmp.uni-hannover.de> <4AF4123A.4080301@andric.com> <20091106231440.4f0f2cbb.gerrit@pmp.uni-hannover.de> <4AF4AAFF.2080104@jrv.org> Organization: Albert-Einstein-Institut (MPI =?ISO-8859-1?Q?f=FCr?= Gravitationsphysik & IGP =?ISO-8859-1?Q?Universit=E4t?= Hannover) X-Mailer: Sylpheed 2.7.1 (GTK+ 2.12.11; i386-portbld-freebsd7.0) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-PMX-Version: 5.5.5.374460, Antispam-Engine: 2.7.1.369594, Antispam-Data: 2009.11.12.115426 Cc: freebsd-fs@freebsd.org Subject: Re: trace for zfs panic mounting fs after crash with RC2 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Nov 2009 12:06:18 -0000 On Fri, 06 Nov 2009 17:02:23 -0600 "James R. Van Artsdalen" wrote about Re: trace for zfs panic mounting fs after crash with RC2: JRVA> How the ZIL got corrupted - if it did - is a harder question. What JRVA> kind of hard disk is this, and how is it connected to the system? JRVA> Was there any redundancy (mirror, raidz)? I have been thinking about this for some time now. I have almost the same controller (low-profile version, different bios, but otherwise identical) in use without these problems. Can the 2.5" disks cause any problems? The problematic system is the only one I have with the small drives. Maybe they somehow "lie" to the system about the data actually being written? I remember that a long time ago (about 10 years?) FreeBSD people suggested to turn off the write cache of disk drives to prevent data losses. I see that the sysctl hw.ata.wc is still there. Do people here think that this is worth giving a try? Are there any recent experiences concerning the performance-wise impact on zfs when turning off wc? cu Gerrit