RE: Using DVD-RAM drive

The following is from a Tape speeds and feeds document I got a while back.
I hope the formatting holds.

I beleive you can get most the info from the following documents:
http://www-1.ibm.com/servers/eserver/iseries/perfmgmt/resource.htm



Other Performance Numbers for reference (user mix data):
DVD                     1.5 GB/hr     from Steve Hank's note (check for
official number from perf capabilities guide)
DVD - no compression    2.5 GB/hr     from V5R2 Perf Guide (note restore is
faster than save)
DVD - w compression     6.5 GB/hr     from V5R2 Perf Guide (note restore is
faster than save)
1.2-2.5 GB QIC          1.8 GB/hr     from Bruce Masters' Chart
7208-12, 222-234        2.5 GB/hr     from Bruce Masters' Chart
13 GB QIC               5   GB/hr     from Bruce Masters' Chart
MLR1 QIC                7.5 GB/hr     from V5R1 Perf Guide
MLR3 QIC                9   GB/hr     from V5R1 Perf Guide
7208-342                10  GB/hr     from V4R5 Perf Guide, in section re
V4R3 perf
3570-B                  13  GB/hr     from above
SLR 100 QIC             22  GB/hr     from V5R1 Perf Guide <<<< comparable
to 3570-C
3570-C                  22  GB/hr     from above
VXA-2 8mm on 8xx        36  GB/hr     from above
LTO-1 SCSI on 8xx       68 GB/hr      from above
LTO-1 fibre on 8xx      78 GB/hr      from above
Savefile (=<V5R1)       135-170 GB/hr from V5R2 Perf Guide (user mix/very
large file) - 2002 version
Savefile (=>V5R2)       200-480 GB/hr from V5R2 Perf Guide (user mix/very
large file) - 2002 version
Savefile on fc 2757 ioa 225-550 GB/hr from V5R2 Perf Guide (user mix/very
large file) - May 2003
LTO-2 SCSI on 8xx       tbd
LTO-2 fibre on 8xx      110 GB/hr from above



----------------------------
Bryan Dietz
Aktion Associates


midrange-l-bounces@xxxxxxxxxxxx wrote on 02/01/2005 05:27:27 AM:

> Hi Charles
>
> without wanting to provide quotable benchmarking figures, yes the DVD's
are
> incredibly slow. My recollection is something like 4 1/2 hours for a
system
> save versus about 45 minutes in a 3580 (thereabouts anyway).
>
> I was also disappointed that they are not supported by BRMS. I'm taking
> this as a sign,
>
> Regards
> Evan Harris
>
> >Ok,
> >
> >Some more info.
> >
> >On the SAVSAVFDTA job, for a long, long time, the job showed 39
> >milliseconds of CPU time used.
> >
> >But finally, after about 70min.  The job finished, only showed 1 second
> >used of CPU time.
> >
> >
> >Now, for comparison, the creation of the save file took only about
> >5min.  The save file size ended up being just over 3 gigs.
> >
> >Is 45 MB/min correct or what?  My PC DVD burner, using an RW disk with
the
> >packet writing driver InCD, does much better than that.
> >
> >Charles Wilt
> >iSeries Systems Administrator / Developer
> >Mitsubishi Electric Automotive America
> >ph: 513-573-4343
> >fax: 513-398-1121
>