From owner-freebsd-questions@FreeBSD.ORG Thu Mar 16 18:46:13 2006 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 8970B16A424 for ; Thu, 16 Mar 2006 18:46:13 +0000 (UTC) (envelope-from don@lizardhill.com) Received: from bigbird.whtech.com (bigbird.whtech.com [64.125.72.2]) by mx1.FreeBSD.org (Postfix) with SMTP id 5386C43D55 for ; Thu, 16 Mar 2006 18:46:10 +0000 (GMT) (envelope-from don@lizardhill.com) Received: (qmail 78739 invoked by uid 0); 16 Mar 2006 18:37:59 -0000 Received: from unknown (HELO mickey) (unknown) by unknown with SMTP; 16 Mar 2006 18:37:59 -0000 From: "Don O'Neil" To: "'Chuck Swiger'" Date: Thu, 16 Mar 2006 10:38:05 -0800 Message-ID: <040601c64928$c3a4e140$0300020a@mickey> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 In-Reply-To: <44196B67.6090108@mac.com> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2670 Thread-Index: AcZI/8xqqti71rgXSoahxVU5wvE0IAAKJ9+w Cc: freebsd-questions@freebsd.org Subject: RE: Raidtest/3Ware 6000 Throughput 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: Thu, 16 Mar 2006 18:46:13 -0000 I would have thought I would at least see the raw single drive throughput, plus maybe a bit more. I've benched these drives independantly at 20+ MB/second... Is the 3ware card really slowing things down that much with the RAID-5 overhead? What "real HW RAID-5" controller would you suggest? I'd like to stick with IDE/ATA since I have a bunch of drives already. Am I maybe CPU bound, or have another issue? -----Original Message----- From: owner-freebsd-questions@freebsd.org [mailto:owner-freebsd-questions@freebsd.org] On Behalf Of Chuck Swiger Sent: Thursday, March 16, 2006 5:43 AM To: Don O'Neil Cc: freebsd-questions@freebsd.org Subject: Re: Raidtest/3Ware 6000 Throughput Don O'Neil wrote: [ ... ] > Does this seem accurate? Should I only be seeing 4.7 MB/second > throughput or is raidtest just not a good way to measure peak throughput? > > Any thoughts would be appreciated. It does not astonish me that you get 5 MB/s on a RAID-5 config, although if you used SCSI and/or a real HW RAID-5 controller with significant cache (ie, 64+ MB) that would help the performance by quite a bit. Use RAID-5 for read-only or read-mostly situations and you'll be better off; use RAID-10 for write-heavy filesystems instead. -- -Chuck _______________________________________________ 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"