From owner-freebsd-questions@FreeBSD.ORG Mon Feb 23 23:58:18 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6746416A4CF for ; Mon, 23 Feb 2004 23:58:18 -0800 (PST) Received: from ozlabs.org (ozlabs.org [203.10.76.45]) by mx1.FreeBSD.org (Postfix) with ESMTP id BC19543D2D for ; Mon, 23 Feb 2004 23:58:17 -0800 (PST) (envelope-from grog@lemis.com) Received: from blackwater.lemis.com (blackwater.lemis.com [192.109.197.80]) by ozlabs.org (Postfix) with ESMTP id 3FF0C2BD53 for ; Tue, 24 Feb 2004 18:58:15 +1100 (EST) Received: by blackwater.lemis.com (Postfix, from userid 1004) id DBD5A5121D; Tue, 24 Feb 2004 18:28:12 +1030 (CST) Date: Tue, 24 Feb 2004 18:28:12 +1030 From: Greg 'groggy' Lehey To: Danny Carroll Message-ID: <20040224075812.GI87020@wantadilla.lemis.com> References: <1077093269.15aypd5fp76s@mailsrv.dannysplace.net> <20040218111653.GB289@marvin.home.local> <1077106518.yyrhxqeampw@mailsrv.dannysplace.net> <20040218140429.GG289@marvin.home.local> <1077180395.4prky8v4skqo@mailsrv.dannysplace.net> <20040219222221.GA88317@marvin.home.local> <20040223043113.GV87020@wantadilla.lemis.com> <1077536659.61xvlite2kso@mailsrv.dannysplace.net> <20040224001635.GM87020@wantadilla.lemis.com> <1077607815.7l8mfcl97gso@mailsrv.dannysplace.net> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="jp3593ZFbct1pBYM" Content-Disposition: inline In-Reply-To: <1077607815.7l8mfcl97gso@mailsrv.dannysplace.net> User-Agent: Mutt/1.4.1i Organization: The FreeBSD Project Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.FreeBSD.org/ X-PGP-Fingerprint: 9A1B 8202 BCCE B846 F92F 09AC 22E6 F290 507A 4223 cc: Tony Frank cc: freebsd-questions@freebsd.org Subject: Re: Help with Vinum disk crash... X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Feb 2004 07:58:18 -0000 --jp3593ZFbct1pBYM Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tuesday, 24 February 2004 at 8:30:15 +0100, Danny Carroll wrote: >>> vinum and ide on my system results is very poor disk performance, I >>> see a 10-fold increase in read/write actions. I'll be interested in >>> revisiting vinum with some SCSI disks sometime soon. >> >> How did you test it? > > I have 4 ata133 ide disks, all identical. They run off a promise ata133 io > card. > > With vinum, all 4 disks are accessed at pretty much the same time, no matter > what you do. No, that's not correct. It does happen if you choose too small a stripe size, but that's the best reason for choosing larger stripes. That's described in much detail in the man page. > Without, you only access the disk that you are writing to. It goes > a lot faster but I have to manage my data usage more. > > I dont blame vinum, I blame my ide subsystem. No, it's not your IDE subsystem. That usually works better than you think. But performance is an issue. You need to test with access patterns which relate to what you're really doing: sequential access testing can often prove irrelevant. Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply or reply to the original recipients. For more information, see http://www.lemis.com/questions.html Note: I discard all HTML mail unseen. Finger grog@FreeBSD.org for PGP public key. See complete headers for address and phone numbers. --jp3593ZFbct1pBYM Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iD8DBQFAOwQUIubykFB6QiMRAvLuAKCbLF6cDE1VtnK9LUb+Ov5UB4g2VQCfaIFx pwp2VlhTyyZRRW+uBRl/zfA= =oCok -----END PGP SIGNATURE----- --jp3593ZFbct1pBYM--