Gil,
Please, pay attention to "human-operated". I did not use MTL
intentionally, for the reasons described below.
ATL means Automated Tape Library. Sometimes people call it "robot".
Sometimes it is VTS. Sometimes VTS don't have physical tapes at backend
- so there is no physical robot.
ATL could also mean IBM tape library - important for system definitions.
Other vendors do not make IBM-compatible ATLs and tend to use MTL
definition - Manual Tape Library for their robots and VTLs/VTSes. This
is because of system management.
However there are real MTLs and real installations with so called stand
alone tapes - just bunch of drives operated by human operators. And tons
of cartridges on shelves. Just like in the old times of open reels. In
this case it is up to operator what tape will be mounted. ...and it is
up to RMM (or other TMS) to be a supervisor. However it is perfectly
possible to mount "this green cart with label LBL001, you know which
one". And the green cart (actually green sticker) can be one of dozen
carts labeled as LBL001. How to identify them? Very simple: one is
green, the second is almost green, third is also green but there is
marker sign "not this one", etc. etc.
Ridiculous? Well, my colleague used diskettes in that way. No, instead
of stickers he used pencil and coffee stains to identify. Was it
working? NO!
--
Radoslaw Skorupka
Lodz, Poland
W dniu 22.11.2020 o 03:57, Paul Gilmartin pisze:
On Sun, 22 Nov 2020 02:10:45 +0100, R.S. wrote:
IMHO it was the same error as nowadays: bad naming.
I didn't work with removable DASD, but I worked with physically
removable, human-operated tapes. And it was administrator responsibility
to have proper naming convention and unique volume serials. Exceptions
in justified scenarios only.
That uniqueness might have been enforced more automatically for tape
than for DASD because the tape volume serial might need to match the
numbered slot in the library.
The scenario justifying an exception might be for mass production of
products distributed to customers: the volser must match that in the
README.
I once had a conflict between the volser in our README and a DASD
volume. Fortunately, ops was able to dismount that DASD logically
long enough for me to write a master tape to send to Manufacturing.
An organization (SHARE?) once tried to maintain a world-wide
registry of tape volser prefixes. They rapidly exhausted the
name space.
UUID?
-- gil
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