Date: Thu, 12 Nov 2009 13:06:15 +0100 From: Gerrit =?ISO-8859-1?Q?K=FChn?= <gerrit@pmp.uni-hannover.de> To: "James R. Van Artsdalen" <james-freebsd-fs2@jrv.org> Cc: freebsd-fs@freebsd.org Subject: Re: trace for zfs panic mounting fs after crash with RC2 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>
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On Fri, 06 Nov 2009 17:02:23 -0600 "James R. Van Artsdalen" <james-freebsd-fs2@jrv.org> 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
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