From owner-freebsd-questions@FreeBSD.ORG Tue Aug 19 02:02:12 2003 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 8FB1916A4BF for ; Tue, 19 Aug 2003 02:02:12 -0700 (PDT) Received: from wantadilla.lemis.com (wantadilla.lemis.com [192.109.197.80]) by mx1.FreeBSD.org (Postfix) with ESMTP id BB23F43F75 for ; Tue, 19 Aug 2003 02:02:10 -0700 (PDT) (envelope-from grog@lemis.com) Received: by wantadilla.lemis.com (Postfix, from userid 1004) id 82EE353151; Tue, 19 Aug 2003 18:32:07 +0930 (CST) Date: Tue, 19 Aug 2003 18:32:07 +0930 From: Greg 'groggy' Lehey To: Niklas Saers Mailinglistaccount Message-ID: <20030819090207.GA20240@wantadilla.lemis.com> References: <20030819095355.C34268@doriath.saers.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="zAIN9dnKNiFxaW1E" Content-Disposition: inline In-Reply-To: <20030819095355.C34268@doriath.saers.com> User-Agent: Mutt/1.4i 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: freebsd-questions@freebsd.org Subject: Re: Vinum performance 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, 19 Aug 2003 09:02:12 -0000 --zAIN9dnKNiFxaW1E Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tuesday, 19 August 2003 at 9:56:13 +0200, Niklas Saers Mailinglistaccou= nt wrote: > Hi all, > I was wondering if anyone can tell me about their experience of Vinum and > its performance on RAID5 systems? I've built a vinum-raid of 4 160Gb disks > that each do a dd if=3D/dev/zero of=3D/dev/adNd of about 60Mb/sec. Howeve= r, > when I've set up my raid, performance drops to 6Mb/sec, and with only > three disks it drops to 4.5Mb/sec. Is this usual?=20 No. You should expect about =BC the write performance of a single disk under these rather contrived circumstances. > Because with this speed I cannot run the system at all. Have you built this system for writing single sectors to a volume using dd? > Any good way of tuning the system? There are some ideas in the man page and the web site. But in general, RAID-5 isn't designed for heavy write accesses. 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 See complete headers for address and phone numbers --zAIN9dnKNiFxaW1E Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iD8DBQE/QeePIubykFB6QiMRAowAAJ9QYbANb5YDElhFK8W31prFTn5t1ACePehf OmMBStLvb54wspmfAAy9xU0= =yY5A -----END PGP SIGNATURE----- --zAIN9dnKNiFxaW1E--