On Aug 4, 2005, at 10:53 AM, Bill Fairchild wrote:
In a message dated 8/4/2005 7:39:11 A.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
GA26-1589-4, Reference Manual for I BM 2835 Storage Control and IBM
2305 Storage Module, p. 1, says
The storage module is a fixed head disk drive module
I accept this as definitive. I don't have access to this
publication. So
the 2305 was/is a disk instead of a drum. Cool. But still I wonder
why so
many of us thought it was a drum way back when, including the IBMers
who wrote
that article in their Systems Journal. Must have been mass hysteria.
Bill Fairchild
Bill,
I think the numbering threw people off 2305 and the drum number were
close.
We had one for the MVT Jobque and when we went MVS we put PLPA on it.
We had one user that for 1 week a month was allowed to put a heavily
used dataset on it. We got tired of the monthly data set placement so
we asked to see their code. Their code was terrible, basically open,
write 3-5 records close and open, read back those records.
I suggested without a code change change JCL to use VIO . It worked
like a charm and the running time on a 2305 went from 3 hours to VIO
was about 14 minutes. IIRC the time on a 3330-11 was 3.0 hours. (it
could have been more but its been 20+ years).
We also (as a cost saving event) went to a solid state device(2305 look
a like) but it blew its brains when we had a power fluctuation. We had
to re-init and redefined the PLPA after each power glitch. We got rid
of it after 2 months.
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