From owner-freebsd-stable@FreeBSD.ORG Mon Mar 28 14:56:56 2011 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 37B19106564A for ; Mon, 28 Mar 2011 14:56:56 +0000 (UTC) (envelope-from alexander@leidinger.net) Received: from mail.ebusiness-leidinger.de (mail.ebusiness-leidinger.de [217.11.53.44]) by mx1.freebsd.org (Postfix) with ESMTP id E0E478FC13 for ; Mon, 28 Mar 2011 14:56:55 +0000 (UTC) Received: from outgoing.leidinger.net (p5B1548A0.dip.t-dialin.net [91.21.72.160]) by mail.ebusiness-leidinger.de (Postfix) with ESMTPSA id F27B9844015; Mon, 28 Mar 2011 16:41:16 +0200 (CEST) Received: from webmail.leidinger.net (webmail.Leidinger.net [IPv6:fd73:10c7:2053:1::2:102]) by outgoing.leidinger.net (Postfix) with ESMTP id EB91117B9; Mon, 28 Mar 2011 16:41:13 +0200 (CEST) Received: (from www@localhost) by webmail.leidinger.net (8.14.4/8.13.8/Submit) id p2SEfDuC067736; Mon, 28 Mar 2011 16:41:13 +0200 (CEST) (envelope-from Alexander@Leidinger.net) Received: from pslux.ec.europa.eu (pslux.ec.europa.eu [158.169.9.14]) by webmail.leidinger.net (Horde Framework) with HTTP; Mon, 28 Mar 2011 16:41:13 +0200 Message-ID: <20110328164113.70512us1tv7w5gcg@webmail.leidinger.net> Date: Mon, 28 Mar 2011 16:41:13 +0200 From: Alexander Leidinger To: Claus Guttesen References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; DelSp="Yes"; format="flowed" Content-Disposition: inline Content-Transfer-Encoding: 7bit User-Agent: Dynamic Internet Messaging Program (DIMP) H3 (1.1.6) X-EBL-MailScanner-Information: Please contact the ISP for more information X-EBL-MailScanner-ID: F27B9844015.AFDDB X-EBL-MailScanner: Found to be clean X-EBL-MailScanner-SpamCheck: not spam, spamhaus-ZEN, SpamAssassin (not cached, score=0.077, required 6, autolearn=disabled, TW_ZF 0.08) X-EBL-MailScanner-From: alexander@leidinger.net X-EBL-MailScanner-Watermark: 1301928077.79173@RF+CLVWr6poExBvF9PXr1Q X-EBL-Spam-Status: No Cc: FreeBSD Stable Subject: Re: zfs, nfs and zil X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Mar 2011 14:56:56 -0000 Quoting Claus Guttesen (from Mon, 28 Mar 2011 13:22:00 +0200): > I've setup a server with FreeBSD 8.2 (prerelase) and patched zfs to > ver. 28. The server has 11 disks each 2 TB in raidz2. The performance > is very good and I've got approx. 117 MB/s on plain GB nics using > iscsi. > > I'm mounting the FreeBSD-server from a couple of vmware esxi 4.1 > servers using nfs, but when there is alot of i/o the server becomes > unresponsive, easily triggered by installing ie. ms-sql. The server > itself is up but is not reachable from the network. When I take the > nic down and up again connection to the network is reestablished > (ip-wise). > > A friend of mine has suggested that I disable the zil. The page > http://wiki.freebsd.org/ZFSTuningGuide says 'Disabling ZIL is not > recommended where data consistency is required (such as database > servers) but will not result in file system corruption.' > > Has anyone tried to disable zil and achieved better performance and > still maintain a consistent filesystem? The ZIL is not linked to NIC down/up events. It is a completely different topic. I suggest to find the real problem instead of doing some random tuning (which is not tuning in this case but foot-shooting). FYI: disabling the ZIL is someting to do if you are desperate, do not care about production incidents, and everything else (if the ZIL is the problem -- which most probably it isn't by reading your message -- a (maybe write optimized) SSD as a log device could be a solution) does not solve the issue. Bye, Alexander. -- I'll eat ANYTHING that's BRIGHT BLUE!! http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137