[email protected] (Shmuel Metz , Seymour J.) writes:
> I'm editing the wikipedia article on Count Key Data, and I've run into
> an editorial dispute. I claim that what is now ECKD was part of the
> SMB, and the other editor claims that you could run 3380 on a slow
> channel without using, e.g., Define Extent. Does anybody have a
> document outlining what IBM included in the term SMB?: Thanks.
Calypso ("speed-matching") feature for 3880 controller allowing 3380s to
be attached to slower channels. I have old email about significant
software & hardware debugging getting it to work.
http://www.garlic.com/~lynn/2007f.html#email801010
http://www.garlic.com/~lynn/2007e.html#email820907
http://www.garlic.com/~lynn/2007e.html#email820907b
We had done a VM370 modification at SJR that did super efficient trace
of all disk record accessed (both by vm370 & virtual machines) what was
installed in several systems in the San Jose/Bay Area. the 10Oct1980
email refers to upgrading to support calypso/eckd CCW. The trace was
used for various things like modeling disk i/o cache configurations. We
had a proposal to have it incorporated into all systems for use in
dynamic load-balancing for placement/location.
some of the ECKD intertwinces with my theme (rant) that it would have
been enormously simpler & less expensive to have added FBA support to
MVS. I had been told that even if I provided them with fully integrated
and tested MVS FBA support ... that i needed a $26M incremental business
case (to cover documentation and education) ... basically $200M-$300M in
additional disk sales ... but they claimed that customers were already
buying disks as fast as they could be made ... so it would just shift
the same amount of sales from CKD to FBA (and therefor it was impossible
for me to show incremental/additional disk sales from FBA support).
http://www.garlic.com/~lynn/submain.html#dasd
this post references that 4341 with small tweak was being used
for testing 3mbyte/sec channel (w/o needing speed matching)
http://www.garlic.com/~lynn/2010e.html#36 What was old is new again (water
chilled)
If POK machines (158, 168, 303x) had been as powerful as 4341 ... there
wouldn't have needed Calypso (speed matching and enormous resources
needed to get it working) ... but then if MVS had FBA support wouldn't
have needed to do 3380 as CKD (even tho inherently it was FBA
underneath) ... or do a 3375/CKD version of 3370/FBA.
other past posts mentioning calypso
http://www.garlic.com/~lynn/2004o.html#7 Integer types for 128-bit addressing
http://www.garlic.com/~lynn/2007e.html#40 FBA rant
http://www.garlic.com/~lynn/2007f.html#0 FBA rant
http://www.garlic.com/~lynn/2008q.html#40 TOPS-10
http://www.garlic.com/~lynn/2009k.html#44 Z/VM support for FBA devices was Re:
z/OS support of HMC's 3270 emulation?
http://www.garlic.com/~lynn/2009p.html#11 Secret Service plans IT reboot
http://www.garlic.com/~lynn/2010e.html#36 What was old is new again (water
chilled)
http://www.garlic.com/~lynn/2010h.html#30 45 years of Mainframe
http://www.garlic.com/~lynn/2010n.html#14 Mainframe Slang terms
http://www.garlic.com/~lynn/2011e.html#35 junking CKD; was "Social Security
Confronts IT Obsolescence"
http://www.garlic.com/~lynn/2012j.html#12 Can anybody give me a clear idea
about Cloud Computing in MAINFRAME ?
http://www.garlic.com/~lynn/2012o.html#64 Random thoughts: Low power, High
performance
http://www.garlic.com/~lynn/2014m.html#154 BDW length vs. Physical Length
--
virtualization experience starting Jan1968, online at home since Mar1970
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