I agree,
Prelabeled taped do NOT make a difference. Make sure if you label
your own tapes that you check and make sure the label libvol command is
successful.
I am using 3590 extended length cartridges that we not only labeled,
but also barcoded. They work great.
Jeff Bach
Home Office Open Systems Engineering
Wal-Mart Stores, Inc.
WAL-MART CONFIDENTIAL
-----Original Message-----
From: Richard Sims [SMTP:rbs AT BU DOT EDU]
Sent: Friday, September 14, 2001 7:03 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: TSM and Extended format tapes.
>How does TSM handles extended length cartridges. Our biggest
concern is
>how does TSM track %full for recycle/reclaim processing?
Nothing special - TSM treats them like any other tape, writing until
it
finally encounters the end of the tape. Perspective: Tapes are like
snowflakes - no two tapes are exactly the same length...and even any
one
tape can vary in length over time. Pct Util is just a pure guess
while
Filling, and gets a true number only when Full.
>If we decide to use extended length cartridges on a NSM, It has
been
>recommend we order them pre-labeled. So we absolutely do not want
to mix
>extended length with standard length in the mainframe libraries.
Whether you label them or the vendor labels them, the tapes are the
same.
I don't see the "a priori" logic of tape labels and mixing in a
library.
You can keep them separate in different Devclasses if you want, with
dedicated drives; but there's no problem mixing them, as I think
most of
us do. As said above, tape length is utterly variable to begin
with,
so even in your pre-existing tape pool you in effect already are
mixing
tapes of varying lengths. That's the essential nature of tape: it's
non-deterministic, unlike disk.
Richard Sims, BU
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