SCSI disk to disk dump restore
Odhiambo Washington
wash at wananchi.com
Tue Aug 24 01:12:07 PDT 2004
* Dan Rue <drue at 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
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