From owner-freebsd-questions@FreeBSD.ORG Mon Aug 6 02:22:30 2007 Return-Path: Delivered-To: questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E507116A417 for ; Mon, 6 Aug 2007 02:22:29 +0000 (UTC) (envelope-from speedtoys.racing@gmail.com) Received: from fk-out-0910.google.com (fk-out-0910.google.com [209.85.128.184]) by mx1.freebsd.org (Postfix) with ESMTP id 6531F13C442 for ; Mon, 6 Aug 2007 02:22:29 +0000 (UTC) (envelope-from speedtoys.racing@gmail.com) Received: by fk-out-0910.google.com with SMTP id b27so1539041fka for ; Sun, 05 Aug 2007 19:22:28 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:references; b=ClP2c0LPLv2UTbpO75WV4Yg4shwsO2PdCT712ugqMo/kWH3EvkMf2xqgP9FU2TFRBBaVBSB/3puhwKRsYheegEdGsInQm+wefv8kg4JvR/8vGb+Zj8xmyY0yTa9mcsEi7afOLLm0YsUaKV6J8GgVcMx//h+2YNV51ohIiu/Qa4g= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:references; b=TO2GSIHC3GXHUEpgW3TJnWa4FyaRY3guj6INUHHN8Hen121//OO67SJwJBuYqjSKD0YCAHh4qHfOGWyMpm1i0JaOBrBDX3ERRwp0F+Ogv2eOeqSf2qrA/4hvkhOM6QMgAeKBYDalFjvprfm41XPR/dUjr11MnBuiQrCVyg2m7t0= Received: by 10.82.151.14 with SMTP id y14mr5065675bud.1186365327286; Sun, 05 Aug 2007 18:55:27 -0700 (PDT) Received: by 10.82.170.5 with HTTP; Sun, 5 Aug 2007 18:55:27 -0700 (PDT) Message-ID: Date: Sun, 5 Aug 2007 18:55:27 -0700 From: "Jeff Mohler" To: "Philip M. Gollucci" In-Reply-To: <46B67C90.3010603@riderway.com> MIME-Version: 1.0 References: <46B67C90.3010603@riderway.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: "questions@FreeBSD.org" Subject: Re: Unbelievably bad RAID-1 performance 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: Mon, 06 Aug 2007 02:22:30 -0000 The EDGE is faster byte wise, not the center. The distance between traditional or perpendicular sectors remains the same, just more of them around the drive at a given distance from the center, than at the center. So..because RPM remains the same at all distances from the center, you will read more sectors per second at the edge, than center. Although..that wont make a 100x difference in speed..I wouldnt think. On 8/5/07, Philip M. Gollucci wrote: > > while writing to the disk > > gstat screenshot > http://people.apache.org/~pgollucci/disks.png > > If I move the location to '/' (da0s1a) which AFAIK is at the center of > disk(smaller thus faster rpms) should be faster, performance is at least > 100times worse which is the opposite I would expect. > > Is there anything I can do to help this out. I'm likely going to chuck > the raid card in the trash and just use one disk and reply on backups > which I already have going. > > Dell PowerEdge 1435SC > Dual Intel Core2 Duo 2.4GHz 4GB RAM > RAID-1 Config with 2 disks@240GB each > FreeBSD 6.2-release-p5 amd64 custom kernel. > > mpt0: port 0xdc00-0xdcff mem > 0xeffec000-0xeffeffff,0xefff0000-0xefffffff irq 35 at device 8.0 on pci7 > mpt0: [GIANT-LOCKED] > mpt0: MPI Version=1.5.12.0 > mpt0: mpt_cam_event: 0x16 > mpt0: Unhandled Event Notify Frame. Event 0x16 (ACK not required). > mpt0: mpt_cam_event: 0x12 > mpt0: Unhandled Event Notify Frame. Event 0x12 (ACK not required). > mpt0: mpt_cam_event: 0x12 > mpt0: Unhandled Event Notify Frame. Event 0x12 (ACK not required). > mpt0: mpt_cam_event: 0x16 > mpt0: Unhandled Event Notify Frame. Event 0x16 (ACK not required). > mpt0: mpt_cam_event: 0xb > mpt0: Unhandled Event Notify Frame. Event 0xb (ACK not required). > > da0 at mpt0 bus 0 target 0 lun 0 > da0: Fixed Direct Access SCSI-5 device > da0: 300.000MB/s transfers, Tagged Queueing Enabled > da0: 237464MB (486326272 512 byte sectors: 255H 63S/T 30272C) > > > > > > > > ------------------------------------------------------------------------ > Philip M. Gollucci (philip@riderway.com) 323.219.4708 > Senior System Admin - Riderway, Inc. http://riderway.com > 1024D/EC88A0BF 0DE5 C55C 6BF3 B235 2DAB B89E 1324 9B4F EC88 A0BF > > Work like you don't need the money, > love like you'll never get hurt, > and dance like nobody's watching. > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" >