ADSM-L

Re: TSM 3.7 -- 9840 Tape drives speed

2000-09-26 09:42:50
Subject: Re: TSM 3.7 -- 9840 Tape drives speed
From: Andy Carlson <andyc AT ANDYC.CARENET DOT ORG>
Date: Tue, 26 Sep 2000 08:41:20 -0500
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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