ADSM-L

Re: tape cartridges with same bar codes

2003-02-09 20:59:58
Subject: Re: tape cartridges with same bar codes
From: "Seay, Paul" <seay_pd AT NAPTHEON DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Sun, 9 Feb 2003 20:58:04 -0500
I suspect that you cannot even check both tapes into the library, though I
have never done it.  This is why.  When you check a volume in as scratch it
checks the volumes table to make sure the volume is not in the table.  This
is to protect the volume contents from being destroyed (referential
integrity).  Before or after this check, do not know which, the checkin is
going to fail (private or scratch) because one of the indexes on the
libvolumes table is volume_name.  A duplicate volume name will occur and the
tape checkin will fail.

This is the beauty of TSM's referential integrity.  It protects us from
ourselves.

I have not actually done this, but I have a US dollar that says the second
checkin/label command will fail.

You will be able to insert both tapes into both libraries so long as you are
not doing the auto checkin/label function of V5.1.

Remember once a tape is in the volumes table it has a device class
associated with it.  So, you cannot simply move a tape from one library to
another.  There is no way to update the device class field in the stgpool
table.  This is a feature I am sure many customers would like to have when
they are balancing the usage of multiple libraries.

Paul D. Seay, Jr.
Technical Specialist
Northrop Grumman Information Technology
757-688-8180


-----Original Message-----
From: Ki-Hwan Kwon [mailto:kihwan AT CS.UALBERTA DOT CA]
Sent: Sunday, February 09, 2003 7:55 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: tape cartridges with same bar codes


Hello,
To simplify my question,
assume that there are two tape cartridges with
same bar codes.
The tapes are extended high performance tapes.
We have two IBM 3494 tape libraries
(I call them as 3494A and 3494B each).
If I put one tape into 3494A dnd if I put the other tape into 3494B, will
this cause a problem to ADSM server due to same bar codes? I have ADSM
installed on an RS/6000 unix server which manages the two libraries. I am a
newbie in ADSM and someone says this will cause a problem but I don't
understand why. Since they are in physically different library, there should
be a way to distinguish the two tapes with same bar codes. Any comments will
be much appreciated. thanks.

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