ADSM-L

Re: TSM 3.7 -- 9840 Tape drives speed

2000-09-26 11:18:24
Subject: Re: TSM 3.7 -- 9840 Tape drives speed
From: "Prather, Wanda" <Wanda.Prather AT JHUAPL DOT EDU>
Date: Tue, 26 Sep 2000 11:17:28 -0400
If you want to take the TSM DB out of the calculation, try writing a large
file to the drive with something else, like tar.
If you get the same MB/sec rate, then the bottleneck is somewhere in the
drive/hardware configuration or in AIX.


        [Prather, Wanda]
> -----Original Message-----
> From: Andy Carlson [SMTP:andyc AT ANDYC.CARENET DOT ORG]
> Sent: Tuesday, September 26, 2000 9:41 AM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      Re: TSM 3.7 -- 9840 Tape drives speed
>
> We have noticed the same thing, though I don't have any real answers at
> this time.  We have noticed alot of paging/page faulsts, so we are
> increasing the memory from 2GB to 4GB to see if that helps some.  My gut
> feel is the the database is the point of contention (sp?).
>
> Andy Carlson                             |\      _,,,---,,_
> andyc AT andyc.carenet DOT org            ZZZzz /,`.-'`'    -.  ;-;;,_
> BJC Health System                       |,4-  ) )-,_. ,\ (  `'-'
> St. Louis, Missouri                    '---''(_/--'  `-'\_)
> Cat Pics: http://andyc.dyndns.org/animal.html
>
> On Mon, 25 Sep 2000, Vijay Havaralu wrote:
>
> > Hello everyone,
> >
> > Just a question about how to increase tape data copy speed.  We are
> getting
> > a tape copy speed of 15 gb/hr
> > on stk-9840 drives with stk-9710 library.  The tapes can run at a speed
> of
> > 10 MB/sec which count to 36 GB/hr.  We once when adsm-db is small, got a
> > speed of tape copy in 23 minutes (20 gb).  But now invariably
> > we are getting a speed of 20gb  in  1hr  20 minutes (fastest),  that
> counts
> > to about 15 gb/hr. (like move data,
> > or migration or backup stg copies).
> >
> > I appreciate, if any body can give a clue whether the tape can be made
> to
> > copy faster, upto its speed; which
> > adsm-tsm 3.7  or aix-4.3 parameters can help to speed them up.  We have
> 8
> > drives with 4 scsi-cards, each
> > with daisy chaining 2 drives / card-cable; within one library.
> >
> > Thanks in advance, vijay.
> >
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