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:[EMAIL PROTECTED]]
> Sent: Tuesday, September 26, 2000 9:41 AM
> To: [EMAIL PROTECTED]
> 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 |\ _,,,---,,_
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>
> 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.
> >
