Date: Tue, 24 Aug 2004 11:12:10 +0300 From: Odhiambo Washington <wash@wananchi.com> To: Dan Rue <drue@therub.org> Cc: freebsd-questions@freebsd.org Subject: Re: SCSI disk to disk dump restore Message-ID: <20040824081210.GI41956@ns2.wananchi.com> In-Reply-To: <20040823210023.GJ68870@therub.org> References: <20040823210023.GJ68870@therub.org>
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* Dan Rue <drue@therub.org> [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: <QUANTUM ATLAS IV 18 WLS 0808> 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: <SEAGATE ST336607LW 0007> 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? -Wash http://www.netmeister.org/news/learn2quote.html -- +======================================================================+ |\ _,,,---,,_ | Odhiambo Washington <wash@wananchi.com> Zzz /,`.-'`' -. ;-;;,_ | Wananchi Online Ltd. www.wananchi.com |,4- ) )-,_. ,\ ( `'-'| Tel: +254 20 313985-9 +254 20 313922 '---''(_/--' `-'\_) | GSM: +254 722 743223 +254 733 744121 +======================================================================+ "Given the choice between accomplishing something and just lying around, I'd rather lie around. No contest." -- Eric Clapton
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