Anne & Lynn Wheeler wrote:
the study was eventually turned into a presentation by the
disk division delivered to Guide and Share user group meetings
in the '84 time-frame (some extracts from the presentation)
http://www.garlic.com/~lynn/2001l.html#46 MVS History (all parts)
the above is an old posting of the preface to the share presentation.
the title page for that share presentation is
SHARE 63 Presentation B874
DASD Performance Review
8:30 August 16, 1984
Dr. Peter Lazarus
IBM Tie Line 543-3811
Area Code 408-463-3811
GPD Performance Evaluation
Department D18
Santa Teresa Laboratory
555 Bailey Avenue
San Jose, CA., 95150
========================
for a little more drift, STL had told me that even if i provided them
with fully tested and integrated FBA support for MVS ... that it would
still cost $26m to ship ... and I didn't have an ROI business case for
that $26m (i.e. it would just sell the same amount of FBA disk in place
of CKD disk ... so no really new revenue).
The transition to FBA would have (at least) converted the I/O
extravagant multi-track search paradigm for VTOC and PDS directories to
data structures that were loaded (and cached) in memory for
search/lookup. The multi-track search paradigm from the mid-60s that
represented a trade-off in relatively abundant I/O resources for
relatively abundant real storage resources ... was no longer valid even
ten years later.
OS/360 did get partial mitigation for the effects of multi-track search
(and loading) with RAM and BLDL lists.
past postings in this thread:
http://www.garlic.com/~lynn/2006e.html#45 using 3390 mod-9s
http://www.garlic.com/~lynn/2006e.html#46 using 3390 mod-9s
http://www.garlic.com/~lynn/2006f.html#0 using 3390 mod-9s
http://www.garlic.com/~lynn/2006f.html#1 using 3390 mod-9s
http://www.garlic.com/~lynn/2006f.html#2 using 3390 mod-9s
misc. past posts about STL quoting $26m additional to ship MVS FBA
support (even after for already fully integrated and tested).
http://www.garlic.com/~lynn/97.html#16 Why Mainframes?
http://www.garlic.com/~lynn/97.html#29 IA64 Self Virtualizable?
http://www.garlic.com/~lynn/99.html#75 Read if over 40 and have
Mainframe background
http://www.garlic.com/~lynn/2000.html#86 Ux's good points.
http://www.garlic.com/~lynn/2000f.html#18 OT?
http://www.garlic.com/~lynn/2000g.html#51 > 512 byte disk blocks (was:
4M pages are a bad idea)
http://www.garlic.com/~lynn/2001.html#54 FBA History Question (was: RE:
What's the meaning of track overfl ow?)
http://www.garlic.com/~lynn/2001d.html#64 VTOC/VTOC INDEX/VVDS and
performance (expansion of VTOC position)
http://www.garlic.com/~lynn/2001g.html#32 Did AT&T offer Unix to Digital
Equipment in the 70s?
http://www.garlic.com/~lynn/2002.html#5 index searching
http://www.garlic.com/~lynn/2002.html#10 index searching
http://www.garlic.com/~lynn/2002g.html#13 Secure Device Drivers
http://www.garlic.com/~lynn/2002l.html#47 Do any architectures use
instruction count instead of timer
http://www.garlic.com/~lynn/2003.html#15 vax6k.openecs.org rebirth
http://www.garlic.com/~lynn/2003c.html#48 "average" DASD Blocksize
http://www.garlic.com/~lynn/2003m.html#56 model 91/CRJE and IKJLEW
http://www.garlic.com/~lynn/2004d.html#65 System/360 40 years old today
http://www.garlic.com/~lynn/2004g.html#15 Infiniband - practicalities
for small clusters
http://www.garlic.com/~lynn/2004l.html#20 Is the solution FBA was Re:
FW: Looking for Disk Calc
http://www.garlic.com/~lynn/2004l.html#23 Is the solution FBA was Re:
FW: Looking for Disk Calc
http://www.garlic.com/~lynn/2004n.html#52 CKD Disks?
http://www.garlic.com/~lynn/2005c.html#64 Is the solution FBA was Re:
FW: Looking for Disk Calc
http://www.garlic.com/~lynn/2005m.html#40 capacity of largest drive
http://www.garlic.com/~lynn/2005u.html#21 3390-81
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