Bill,

        Thanks for the help.  As for #2, we discovered on one of our
storage pool we were doing collocation by filespace.  This is, what we
believe, to have cause the multiple mounting.

Thanks again,
Rick Smith
Maritz, Inc.
Storage & Security Administration
smithrr AT maritz DOT com
(314) 827-1584

> ----------
> From:         Bill Colwell[SMTP:bcolwell AT DRAPER DOT COM]
> Sent:         Friday, March 06, 1998 10:44 AM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      Re: Using new tapes
>
> In <295401AFA48ED011B0D200805F3132850155F9AD AT mifen-comm07.maritz DOT com>,
> on
> 03/06/98
>    at 09:16 AM, "Smith, Richard" <smithrr AT MARITZ DOT COM> said:
>
> >ADSMer's,
>
> >        I could really use some help... First the specifics
>
> >Server: OS/390 V3R1
> >Clients: NT 4.0, 3.5.1, Novell 4.x, Sun Solaris, UNIX
>
> >        We just switch the type of tape we are using.  We were using
> 3490
> >tapes, and now we are using 3490E tapes.  Last night was the first
> night
> >using them, and I see a couple of problems.  First, I believe 3490E
> tapes
> >are supposed to be able to hold approximately 2 GB per cart. However,
> >looking at the tapes we used last night, there are only three carts
> that
> >come near or over 2 GB.  Most of the tapes show an estimated capacity
> >somewhere between 800 - 900 MB.  There are some that are higher, and
> some
> >lower.  We also noticed that ADSM seemed to use a new tape for every
> >process.  It looked like it would write just a little data on the
> tape, and
> >when a new process started, it grabbed a new tape.
>
> >        I guess these are my questions:
>
> >1.  How do we let ADSM know the tapes should hold approximately 2 GB
> each?
>
> I have started using extended length tapes also.  I didn't tell ADSM
> anything at all about the new tapes.  I just defined the the volumes
> into
> the same storage pool as the single length tapes, same devclass of
> course.
> For the old tapes, the average full tape contains  491 Mb, for the new
> 952
> Mb. The maximum on an old tape is 946 Mb, and for the new 1960 Mb.
> Your numbers are in the ballpark.  Remember, the idea that a 3490E can
> hold
> 2 Gb comes from marketing people!  On rare occasions, when the data
> compresses really well, it will, but on average you will get much less
> than
> 2 Gb.
>
> >2.  Why is ADSM using a new tape each process instead of writing
> until the
> >tape is full?
>
> I have just started testing V3R1 and I saw some strange volume
> selection
> too. I think there is a bug in the server.  I encourage you to call it
> in to
> IBM!
>
> >        Thanks in advance for any help!!
>
> >Thanks,
> >Rick Smith
> >Maritz, Inc.
> >Storage & Security Administration
> >smithrr AT maritz DOT com
> >(314) 827-1584
>
> --
> -----------------------------------------------------------
> Bill Colwell
> C. S. Draper Lab
> Cambridge, Ma
> bcolwell AT draper DOT com
> -----------------------------------------------------------
>