From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id n256jg88127701 for ; Thu, 5 Mar 2009 00:45:43 -0600 Received: from mailsrv1.zmi.at (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id A80AE17212C for ; Wed, 4 Mar 2009 22:45:12 -0800 (PST) Received: from mailsrv1.zmi.at (mailsrv1.zmi.at [212.69.162.198]) by cuda.sgi.com with ESMTP id 26QjUiMymsSCRIJR for ; Wed, 04 Mar 2009 22:45:12 -0800 (PST) Received: from mailsrv2.i.zmi.at (h081217054243.dyn.cm.kabsi.at [81.217.54.243]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client CN "mailsrv2.i.zmi.at", Issuer "power4u.zmi.at" (not verified)) by mailsrv1.zmi.at (Postfix) with ESMTP id C2E7743E5 for ; Thu, 5 Mar 2009 07:44:39 +0100 (CET) Received: from saturn.localnet (saturn.i.zmi.at [10.0.0.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mailsrv2.i.zmi.at (Postfix) with ESMTPSA id CED8D40017A for ; Thu, 5 Mar 2009 07:44:39 +0100 (CET) From: Michael Monnerie Subject: Re: XFS and XEN Date: Thu, 5 Mar 2009 07:44:39 +0100 References: <200902170959.55077@zmi.at> <20090224163823.GA19811@infradead.org> <200902250740.43223@zmi.at> In-Reply-To: <200902250740.43223@zmi.at> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200903050744.39283@zmi.at> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com On Mittwoch 25 Februar 2009 Michael Monnerie wrote: > Q: Which settings are best with virtualization like VMware, XEN, > qemu? > > The biggest problem is that those products seem to also virtualize > disk writes in a way that even barriers don't work anymore, which > means even a fsync is not reliable. Tests confirm that unplugging the > power from such a system even with RAID controller with battery > backed cache and hard disk cache turned off (which is save on a > normal host) you can destroy a database within the virtual machine > (client, domU whatever you call it). > > In qemu you can specify cache=off on the line specifying the virtual > disk. For others I have no information what to do. In as question 26 now http://xfs.org/index.php/XFS_FAQ mfg zmi -- // Michael Monnerie, Ing.BSc ----- http://it-management.at // Tel: 0660 / 415 65 31 .network.your.ideas. // PGP Key: "curl -s http://zmi.at/zmi.asc | gpg --import" // Fingerprint: AC19 F9D5 36ED CD8A EF38 500E CE14 91F7 1C12 09B4 // Keyserver: wwwkeys.eu.pgp.net Key-ID: 1C1209B4 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs