From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id n1OF5ZPO150111 for ; Tue, 24 Feb 2009 09:05:35 -0600 Received: from mailsrv1.zmi.at (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 70F3A1994BB2 for ; Tue, 24 Feb 2009 07:05:03 -0800 (PST) Received: from mailsrv1.zmi.at (mailsrv1.zmi.at [212.69.162.198]) by cuda.sgi.com with ESMTP id pjjjPvxDVyPWfWtE for ; Tue, 24 Feb 2009 07:05:03 -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 DA0DA4288 for ; Tue, 24 Feb 2009 16:04:30 +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 0374D400174 for ; Tue, 24 Feb 2009 16:04:30 +0100 (CET) From: Michael Monnerie Subject: Re: XFS and XEN Date: Tue, 24 Feb 2009 16:04:24 +0100 References: <200902170959.55077@zmi.at> In-Reply-To: <200902170959.55077@zmi.at> MIME-Version: 1.0 Message-Id: <200902241604.29566@zmi.at> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0795217156157677486==" Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com --===============0795217156157677486== Content-Type: multipart/signed; boundary="nextPart2185654.PKAF2mE20u"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit --nextPart2185654.PKAF2mE20u Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Dienstag 17 Februar 2009 Michael Monnerie wrote: > Now I'm sure that the following configuration can destroy a > PostgreSQL 8.3.5 database: > > * Linux host with XEN, XFS filesystem with "nobarrier", RAID > controller with battery backed cache. > * XEN vm with XFS filesystem with "nobarrier" with postgresql > * your daughter with 3.5 years switching off the power supply of the > server I got this answer on the XEN list. It looks like XFS in not very secure.=20 Do you share that opinion? I am still searching for a way to make sure=20 the above never happens again. Should I use ext3/reiserfs/ocfs2 within a=20 XEN domU, or is it not the fault of XFS my database got destroyed? Don't=20 want to blame anyone, but I need a secure environment for the machines=20 that should be in production soon, don't have time to recover databases=20 or whatever just because of a crash. from XEN list: ******************************************** if you don't have highly reliable hardware, with redundant channels and=20 battery backed caches, etc. stay away from XFS. it's a pity, but XFS is only as reliable as the hardware you give it. =20 in other words: you can be really sure that a software issue won't trash=20 your XFS filesystem; but also that a hardware failure definitely will. ext3, OTOH, might not have such an impressive record of correctness; but=20 it's designed with redundancy in mind. almost all vital structures are=20 either replicated or reconstructable from other hints. that makes fsck=20 slow but effective, and in most cases, the journal analysis done when=20 remounting after an unclean shutdown is enough to put it back on track. i sure wish i could use XFS in more circumstances, but the needed=20 hardware is prohibitive. ******************************************** mfg zmi =2D-=20 // 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 --nextPart2185654.PKAF2mE20u Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) iEYEABECAAYFAkmkDH0ACgkQzhSR9xwSCbT4OQCgqxJbHaSSqvIjKoeDEXAHD0Pi QfsAoLGO1ZAte3UJ7pEo7fCAGJyF3U8n =HJ5+ -----END PGP SIGNATURE----- --nextPart2185654.PKAF2mE20u-- --===============0795217156157677486== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs --===============0795217156157677486==--