The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main,alt.folklore.computers as well.
[EMAIL PROTECTED] (Ed Gould) writes: > You have hit it the head. We had a unit that emulated a 2305 (don't > remember which model) it worked well ..... except when we had a power > failure. Then at power up *EVERYTHING* was gone. We had to analyze it > and put a vtoc back and then redefine PLPA and then IPL again to get > the system to use it. I think my hair started to go gray because of > the blasted machine. It was gone within a month. > > Oh, yes we had an application that *NEEDED* (well at least they > thought they did) the 2305. In the month that it was going out, we > got the applications people to use VIO. They were extremely happy > and that was the end of the beast. If the machine survives through a > power blink then I would reconsider it but it would take a lot to do > so. there were STC solid state ... and for internal datacenters there was something referred to as a "1655" (several hundred) from a vendor that was using memory chips that had failed normal acceptance tests ... but could still be used in this manner. they were most commingly used as paging devices and so not surviving power failure wasn't an issue. they were surplanted by 3090 expanded storage (and later really large real memory) and disk controller electronic caches (initially 3880-11 and 3880-13). old email discussing 2305, 1655, and stc electronic disk comparison: http://www.garlic.com/~lynn/2007e.html#email820805 old posts mentioning 1655, 3880-11, and/or 3880-13: http://www.garlic.com/~lynn/2000d.html#13 4341 was "Is a VAX a mainframe?" http://www.garlic.com/~lynn/2001.html#18 Disk caching and file systems. Disk history...people forget http://www.garlic.com/~lynn/2001c.html#17 database (or b-tree) page sizes http://www.garlic.com/~lynn/2001d.html#68 I/O contention http://www.garlic.com/~lynn/2001l.html#53 mainframe question http://www.garlic.com/~lynn/2001l.html#54 mainframe question http://www.garlic.com/~lynn/2001l.html#63 MVS History (all parts) http://www.garlic.com/~lynn/2002.html#31 index searching http://www.garlic.com/~lynn/2002d.html#55 Storage Virtualization http://www.garlic.com/~lynn/2002i.html#17 AS/400 and MVS - clarification please http://www.garlic.com/~lynn/2002l.html#40 Do any architectures use instruction count instead of timer http://www.garlic.com/~lynn/2002o.html#3 PLX http://www.garlic.com/~lynn/2002o.html#52 ``Detrimental'' Disk Allocation http://www.garlic.com/~lynn/2003b.html#7 Disk drives as commodities. Was Re: Yamhill http://www.garlic.com/~lynn/2003b.html#15 Disk drives as commodities. Was Re: Yamhill http://www.garlic.com/~lynn/2003b.html#17 Disk drives as commodities. Was Re: Yamhill http://www.garlic.com/~lynn/2003c.html#55 HASP assembly: What the heck is an MVT ABEND 422? http://www.garlic.com/~lynn/2003f.html#5 Alpha performance, why? http://www.garlic.com/~lynn/2003m.html#39 S/360 undocumented instructions? http://www.garlic.com/~lynn/2004d.html#73 DASD Architecture of the future http://www.garlic.com/~lynn/2004e.html#3 Expanded Storage http://www.garlic.com/~lynn/2004g.html#13 Infiniband - practicalities for small clusters http://www.garlic.com/~lynn/2004g.html#17 Infiniband - practicalities for small clusters http://www.garlic.com/~lynn/2004g.html#18 Infiniband - practicalities for small clusters http://www.garlic.com/~lynn/2004g.html#20 Infiniband - practicalities for small clusters http://www.garlic.com/~lynn/2004l.html#29 FW: Looking for Disk Calc program/Exec http://www.garlic.com/~lynn/2005e.html#5 He Who Thought He Knew Something About DASD http://www.garlic.com/~lynn/2005m.html#28 IBM's mini computers--lack thereof http://www.garlic.com/~lynn/2005m.html#30 Massive i/o http://www.garlic.com/~lynn/2005r.html#51 winscape? http://www.garlic.com/~lynn/2005t.html#50 non ECC http://www.garlic.com/~lynn/2006.html#38 Is VIO mandatory? http://www.garlic.com/~lynn/2006c.html#1 Multiple address spaces http://www.garlic.com/~lynn/2006c.html#8 IBM 610 workstation computer http://www.garlic.com/~lynn/2006c.html#46 Hercules 3.04 announcement 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/2006i.html#41 virtual memory http://www.garlic.com/~lynn/2006j.html#11 The Pankian Metaphor http://www.garlic.com/~lynn/2006j.html#14 virtual memory http://www.garlic.com/~lynn/2006k.html#57 virtual memory http://www.garlic.com/~lynn/2006r.html#36 REAL memory column in SDSF http://www.garlic.com/~lynn/2006s.html#30 Why magnetic drums was/are worse than disks ? http://www.garlic.com/~lynn/2006s.html#32 Why magnetic drums was/are worse than disks ? http://www.garlic.com/~lynn/2006v.html#31 MB to Cyl Conversion http://www.garlic.com/~lynn/2006y.html#35 The Future of CPUs: What's After Multi-Core? http://www.garlic.com/~lynn/2007c.html#0 old discussion of disk controller chache http://www.garlic.com/~lynn/2007c.html#12 Special characters in passwords was Re: RACF - Password rules http://www.garlic.com/~lynn/2007c.html#23 How many 36-bit Unix ports in the old days? http://www.garlic.com/~lynn/2007e.html#2 Securing financial transactions a high priority for 2007 http://www.garlic.com/~lynn/2007e.html#38 FBA rant http://www.garlic.com/~lynn/2007e.html#42 FBA rant http://www.garlic.com/~lynn/2007e.html#59 FBA rant http://www.garlic.com/~lynn/2007e.html#60 FBA rant http://www.garlic.com/~lynn/2007o.html#26 Tom's Hdw review of SSDs http://www.garlic.com/~lynn/2007s.html#9 Poster of computer hardware events? http://www.garlic.com/~lynn/2007u.html#4 Remembering the CDC 6600 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
