At 12:28 -0400 on 10/30/2015, Tony Harminc wrote about Re: Releasing
Orphan Storage without IPL:
On 30 October 2015 at 07:02, Elardus Engelbrecht
<elardus.engelbre...@sita.co.za> wrote:
As I have said in March 2013 - "We have a trophy just for such
disasters. The new owner keeps it until another
person makes an error..."
Well it seems to be war-story Friday.
This one happened years ago at one of the shops I worked at. We had
2314 DASD. For those who do not remember these units used removable
disks and each unit had 9 draws for the disks. The address of the
draw was defined by a plug that had the address to be assigned to it
(you plugged it into the slot assigned to that draw). The plugs were
numbered xx0-xx7. If you had a second unit it had address xx8-xxF
(and the plugs had these numbers on them although the xx8-xxF plugs
were the same as the xx0-xx7 ones - IOW: A xx8 plug was the same as a
xx0 one). You could premount a new volume by putting it in the draw
with no plug and mount it by dismounting another volume and moving
the plug of the dismounted volume to the new volumes draw slot.
There was a new operator who had come from a shop with only one 2314
unit (ie: 9 draws) and the shop had 2 2314s (ie: 2 9-draw units with
the 2nd being xx8-xxF). The operator had premounted a new volume in
the empty draw on the 0-7 unit (as he was used to doing) and when a
drive on the 8-F unit was dismounted by the system and it called for
the new volume he had premounted he pulled the plug from the 8-F unit
and plugged it unto the spare draw on the 0-7 unit. BIG CRASH since
there were now two draws with the same address. All would have been
OK if he, knowing that a 8-F volume was going to be dismounted, had
premounted the new volume in the 8-F spare draw.
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