From owner-freebsd-scsi@FreeBSD.ORG Mon Nov 28 05:31:22 2005 Return-Path: X-Original-To: freebsd-scsi@freebsd.org Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4CB4816A422 for ; Mon, 28 Nov 2005 05:31:22 +0000 (GMT) (envelope-from scottl@samsco.org) Received: from pooker.samsco.org (pooker.samsco.org [168.103.85.57]) by mx1.FreeBSD.org (Postfix) with ESMTP id B65C143D5D for ; Mon, 28 Nov 2005 05:31:14 +0000 (GMT) (envelope-from scottl@samsco.org) Received: from [192.168.254.14] (imini.samsco.home [192.168.254.14]) (authenticated bits=0) by pooker.samsco.org (8.13.4/8.13.4) with ESMTP id jAS5V8WI071829; Sun, 27 Nov 2005 22:31:09 -0700 (MST) (envelope-from scottl@samsco.org) Message-ID: <438A961C.2030504@samsco.org> Date: Sun, 27 Nov 2005 22:31:08 -0700 From: Scott Long User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.7) Gecko/20050416 X-Accept-Language: en-us, en MIME-Version: 1.0 To: user References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-1.4 required=3.8 tests=ALL_TRUSTED autolearn=failed version=3.1.0 X-Spam-Checker-Version: SpamAssassin 3.1.0 (2005-09-13) on pooker.samsco.org Cc: freebsd-scsi@freebsd.org, "Kenneth D. Merry" Subject: Re: configuration choices with Dell CERC (adaptec 2610SA) X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Nov 2005 05:31:22 -0000 user wrote: > > On Sat, 26 Nov 2005, Kenneth D. Merry wrote: > > >>>>It would be better to let the rebuild happen as fast as possible. Disks >>>>have a bad habit of failing in groups, and you don't want to increase >>>>the chance of a multi-disk failure by making recovery slow. >>> >>>So again ... only using mirrors ... and in a two-drive chassis, I can't >>>have a hot spare, so I am not sure if it even really matters what I set >>>that to ... comments ? >> >>If you only have a two drive chassis, your best bet is to replace a failed >>drive as soon as you can and let the rebuild complete as soon as you can. > > > > This Dell CERC (adaptec 2610sa) is the first card I have seen with this > rebuild-priority setting. Out of curiosity, of the three choices I have > (low medium high), which choice approximates the behavior that the older > cards (PERCs, etc.) had that _did not_ give you this choice ? > > Thanks so much for your (and everyone elses) great comments on this > thread. > > > The aac line of controllers have had task priority selection for at least the last 6.5 years that I've been using them. Maybe it's only now being exposed to someplace that you've noticed? Anyways, the default priority for all tasks is 'high'. Scott