From owner-freebsd-questions@FreeBSD.ORG Tue Aug 24 18:08:11 2004 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 97E5016A4CE for ; Tue, 24 Aug 2004 18:08:11 +0000 (GMT) Received: from corb.mc.mpls.visi.com (corb.mc.mpls.visi.com [208.42.156.1]) by mx1.FreeBSD.org (Postfix) with ESMTP id 47E1843D4C for ; Tue, 24 Aug 2004 18:08:09 +0000 (GMT) (envelope-from drue@therub.org) Received: from egypt.therub.org (therub.org [209.98.146.43]) by corb.mc.mpls.visi.com (Postfix) with ESMTP id 8AACF83A8; Tue, 24 Aug 2004 13:08:08 -0500 (CDT) Received: by egypt.therub.org (Postfix, from userid 1001) id 443FB455D77; Tue, 24 Aug 2004 13:08:08 -0500 (CDT) Date: Tue, 24 Aug 2004 13:08:08 -0500 From: Dan Rue To: Odhiambo Washington , freebsd-questions@freebsd.org Message-ID: <20040824180808.GN68870@therub.org> References: <20040823210023.GJ68870@therub.org> <20040824081210.GI41956@ns2.wananchi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040824081210.GI41956@ns2.wananchi.com> User-Agent: Mutt/1.4.2.1i Subject: Re: SCSI disk to disk dump restore 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, 24 Aug 2004 18:08:11 -0000 On Tue, Aug 24, 2004 at 11:12:10AM +0300, Odhiambo Washington wrote: > * Dan Rue [20040824 00:01]: wrote: > > Hey Gang, > > > > I had an older scsi disk going bad, so I picked up a new disk to replace > > it. I did a dump | restore to move the data to the new disk, but it > > went far slower than expected. I'm wondering if there's an issue with > > the different disk speeds. > > > > Old disk from dmesg: > > da0: Fixed Direct Access SCSI-3 device > > da0: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled > > da0: 17522MB (35885168 512 byte sectors: 255H 63S/T 2233C) > > > > New disk, as reported by dmesg (it's a seagate U320): > > da2: Fixed Direct Access SCSI-3 device > > da2: 80.000MB/s transfers (40.000MHz, offset 63, 16bit), Tagged Queueing Enabled > > da2: 35003MB (71687372 512 byte sectors: 255H 63S/T 4462C) > > > > The dump was 13G, and took about 2 hours. I calculated that out to be > > about 1.8MB/s. Of course, that's total time I'm sure there's some dump > > overhead (though, i didn't use -L) - but still, 2 hours for 13G?! > > Well, depends! I used a dump|restore (without -L) recently and it took > me like 5 hours to complete the dump for 28GB. > > > > I'm thinking there was a jumper or parameter I should have set due to > > the different disk types. Note that I removed da0, but there's still > > another quantum in the machine on the scsi chain. > > I also had another disk on the SCSI chain. > > How much time did you expect to achieve as optimum? Based on what > factors? Ok, well that's good enough for me. I don't have a lot of experience with SCSI or dump - so I thought maybe I was hitting some caveat, especially with the mixed drive types. Thanks for the info it sounds like my numbers were about right after all. drue