From owner-freebsd-questions@FreeBSD.ORG Wed Jul 27 04:23:39 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org 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 D132016A41F for ; Wed, 27 Jul 2005 04:23:39 +0000 (GMT) (envelope-from glenn@antimatter.net) Received: from cobalt.antimatter.net (cobalt.antimatter.net [69.55.224.239]) by mx1.FreeBSD.org (Postfix) with ESMTP id 93F3F43D46 for ; Wed, 27 Jul 2005 04:23:39 +0000 (GMT) (envelope-from glenn@antimatter.net) Received: from glenn-mobile.antimatter.net (cpe-66-27-86-22.san.res.rr.com [66.27.86.22]) (authenticated bits=0) by cobalt.antimatter.net (8.13.4/8.13.4) with ESMTP id j6R4Nbtm018874 (version=TLSv1/SSLv3 cipher=DES-CBC3-SHA bits=168 verify=NO); Tue, 26 Jul 2005 21:23:38 -0700 Message-Id: <6.1.0.6.2.20050726211444.18e82a00@cobalt.antimatter.net> X-Sender: lists@cobalt.antimatter.net X-Mailer: QUALCOMM Windows Eudora Version 6.1.0.6 Date: Tue, 26 Jul 2005 21:19:36 -0700 To: Chuck Swiger , ".VWV." From: Glenn Dawson In-Reply-To: <42E6FCC5.8070309@mac.com> References: <007b01c59251$925c5ca0$98edfea9@workstation> <42E6FCC5.8070309@mac.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Cc: freebsd-questions@freebsd.org Subject: Re: certance DAT X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 Jul 2005 04:23:39 -0000 At 08:17 PM 7/26/2005, Chuck Swiger wrote: ...so it's not exactly super-zippy, either. Hmm, is it just me, or are the following numbers significantly low for a RAID-1 of two 10K RPM U320 SCSI disks...? >/dev/amrd1 > 512 # sectorsize > 73274490880 # mediasize in bytes (68G) > 143114240 # mediasize in sectors > 8908 # Cylinders according to firmware. > 255 # Heads according to firmware. > 63 # Sectors according to firmware. > >Seek times: > Full stroke: 250 iter in 1.824059 sec = 7.296 msec > Half stroke: 250 iter in 1.805398 sec = 7.222 msec > Quarter stroke: 500 iter in 4.254147 sec = 8.508 msec > Short forward: 400 iter in 2.821081 sec = 7.053 msec > Short backward: 400 iter in 2.860203 sec = 7.151 msec > Seq outer: 2048 iter in 8.821875 sec = 4.308 msec > Seq inner: 2048 iter in 9.006505 sec = 4.398 msec >Transfer rates: > outside: 102400 kbytes in 9.242111 sec = 11080 kbytes/sec > middle: 102400 kbytes in 9.230325 sec = 11094 kbytes/sec > inside: 102400 kbytes in 10.779231 sec = 9500 kbytes/sec > >[ This is running RELENG_5_4... ] I would have expected the transfer rates to be about twice what they're listed as here. Though I don't know how you measured them. If you want to see something interesting, create a ufs1 file system on the same raid 1 using FreeBSD 4.x. Then mount it in 5.x and do your test for transfer rates. Compare that to either ufs1 or ufs2 on the same raid 1 as created by 5.4. The results are very interesting. -Glenn >-- >-Chuck