jmfbahciv said:
Using IBM systems means that you were exposed to a mindset that was
based on handling huge amounts of data processing, not huge numbers
of users demanding instant gratification. Both require different
tradeoffs when developing the monitor and supporting software.
they let me play disk engineer in bldg 14&15 in the late 70s & early 80s
.... some past posts
http://www.garlic.com/~lynn/subtopic.html#disk
there was joke that i worked 4-shift week, 1st shift in sjr/bldg.28, 2nd
shift in bldgs. 14&15, 3rd shift in stl/bldg.90, and 4th shift at HONE.
part of what kick it off were all the test cells were running
"stand-alone", dedicated machine time (one at a time). They had tried
MVS ... for possibly doing multiple testing concurrently ... but MVS
(at the time) MTBF was 15-minutes. Basically these were devices under
development and tended to have error rates that wouldn't be found in
normal business operation.
I sat a task to rewrite i/o supervisor so that it was completely bullet
proof and never fail ... allowing on-demand, concurrent/multiple testing
.... significantly improving productivity. One of the problems was that I
happened to mention the MVS MTBF number in an internal report describing
the effort. Even tho it wasn't for public consumption ... it still
brought down the wrath of the MVS organization on me (informally I was
told that any corporate level awards or anything else at the corporate
level would be blocked by the MVS organization).
Another informal example (old email) of statements that the MVS
organization objected to (even when they were purely for internal
consumption):
http://www.garlic.com/~lynn/2007.html#email801015
.... basically prior to product ship, a collection of 57 normally
expected 3380 errors were specified ... and with hardware aid ... they
could be generated on demand. All resulted in MVS crashing ... and in
65% of the cases there was no indication of what was the problem that
forced the re-IPL.
It contributed to being periodically being told that I didn't have a
career with the company.
Possibly the largest (virtual machine) time-sharing service during
the period was HONE. It had started out with cp67 for branch office
young SEs being able to work with operating systems after 23jun69
unbundling announcement. misc. past posts mentioning unbundling:
http://www.garlic.com/~lynn/submain.html#unbundle
It eventually transitioned to providing online world-wide sales &
marketing support. The multiple cp67 (in the US) transitioned to vm370
and clones started to be created at various places around the world. In
the late 70s, the various US HONE datacenters were consolidated in
single place (multiple loosely-coupled SMP processors). That HONE
operation had something approaching 40,000 defined users in the 1980
timeframe. misc. past posts mentioning HONE (&/or APL)
http://www.garlic.com/~lynn/subtopic.html#hone