• Subject: Re: 8MM tape clarification
  • From: "Emilio Padilla T." <vpadilla@xxxxxxxxx>
  • Date: Fri, 5 Mar 1999 20:44:04 -0600

It's look like no one knows how to predict the capacity of a 8mm tape.
That's normal because of the differences on lenght of the tapes.  I think
this is gonna be a hard to solve yet.
You have another way to resolve appoach this problem.
1. create a save file on your system every day. (crtsavf backups/&date or
something)
2. Make your backup to this save file (savlib lib(BPCSF) DEV(*SAVF) ...)
3. During labor hours copy the save file to tape.  (SAVSAVFDTA) The result
would be the same if you did your savlib directly to tape.  If you need more
tapes deal with it at labor hours.

4. Remove the savf object from disk

This will resolve your problem of getting out of bed at 2:00 in the morning.

If you have concern about a system crash at night, you could create a new
asp on your system y create your library backups on it.

Emilio Padilla
Padilla Asociados
vpadilla@guate.net

----- Original Message -----
From: Dennis Munro <DMunro@badgerminingcorp.com>
To: 'Midrange Users' <Midrange-L@midrange.com>
Sent: Viernes 5 de Marzo de 1999 09:15 AM
Subject: 8MM tape clarification


One thing I did not explain in my question yesterday was this backup is of
the main BPCS library BPCSF.  It is "ONLY" to be used if there is a problem
detected which would then get loaded onto the Test/Dev machine.  This way
the problem could be diagnosed, a fix determined,  and I am not messing
around in my "live" data.

I also do a SAVCHGOBJ every night to a 3570 tape library and on Saturday
night I do SAVLIB of all user libraries.  The 8mm is just a save of this one
library just in case something goes wrong.  We are still new to BPCS and are
trying to give ourselves a way to correct and diagnose things that go bump
in the night.  Obviously, the library is constantly changing in size so the
number of saves per tape I can get is not cast in concrete.

What I really should do is pull that backup out of my "nightly" backup so it
doesn't affect my system coming back on line after the backup is done if the
tape gets full.  Just run it through the job scheduler as a separate job to
run at the same time as my nightly backup.

I was looking for a way to determine the maximum usage of a tape.  Getting
rolled out at 2:00 AM to change a tape should make me realize that tapes are
"cheap", this is not a life and death type of backup(until I really need
it), and sleeping is preferred at 2:00 AM over getting out in the cold and
snow to drive to work to change a tape.

Just trying to be proactive about spending money and figured there has to be
a way to figure this out.  Talking to people who know more about tape and
tape formats than I was the reason for the question.

Again, thanks to you who responded to my original question.  I am still open
to further suggestions and that is what I like about this type of forum.

Dilbert's Words Of Wisdom:
"I love deadlines.  I especially like the whooshing sound they make as they
go flying by."

Dennis Munro
Badger Mining Corporation
dmunro@badgerminingcorp.com <mailto:dmunro@badgerminingcorp.com>

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