[email protected] (Ed Jaffe) writes: > There should still be write inhibit "switch" for a volume, even if > only a logical one. It can be very useful, when running under z/VM, to > be able to define some z/OS volumes as read-only. It would be nice if > you could do something similar in a z/OS LPAR.
re: http://www.garlic.com/~lynn/2014d.html#17 Write Inhibit I had a bunch of stuff from undergraduate days in the 60s and from cambridge science center days in the 70s ... triple-replicated on three different tapes in the Almaden Research Tape Library. In the mid-80s, the Almaden datacenter had an operational problem with mounting random library tapes as scratch ... and I lost all three tapes. The only thing that was saved was the original CMS multi-level source update programs that had originally been done at the science center circa 1971. Melinda had contacted me (shortly before the incident) if I had any information ... and was able to retrieve and send her a full copy. for other topic drift ... after we left IBM in the early 90s, we had been called in to consult with small client/server startup that wanted to do payment transactions on their server, they had also invented this technology called "SSL" they wanted to use; the result is now frequently called "electronic commerce". Part of the work was mapping "SSL" technology to business processes. I had only advisory control over the webserver/browser deployment and operation ... and almost immediately they violated several of the "recommendations" ... which continues to account for some number of the exploits that continue until this day. However I did have complete authority over the webserver to payment gateway (payment gateway sits on the internet and handles interface between webservers and financial payment networks) ... some past posts http://www.garlic.com/~lynn/subnetwork.html#payment the payment gateway was never compromised. It had multiple layers of firewalls and other protections. The actual gateways were multiple machines in high-availability configurations ... and built in nearly such a way that nearly everything ran from disk drives that had "write inhibit" enabled. as an aside ... last product done before leaving IBM was HA/CMP (high availability, cluster multiprocessor) ... some past posts http://www.garlic.com/~lynn/subtopic.html#hacmp past posts mentioning the almaden incident http://www.garlic.com/~lynn/2003j.html#14 A Dark Day http://www.garlic.com/~lynn/2006w.html#42 vmshare http://www.garlic.com/~lynn/2007l.html#51 Scholars needed to build a computer history bibliography http://www.garlic.com/~lynn/2009.html#8 Is SUN going to become x86'ed ?? http://www.garlic.com/~lynn/2009n.html#66 Evolution of Floating Point http://www.garlic.com/~lynn/2009s.html#17 old email http://www.garlic.com/~lynn/2010b.html#51 Source code for s/360 http://www.garlic.com/~lynn/2010e.html#32 Need tool to zap core http://www.garlic.com/~lynn/2010q.html#45 Is email dead? What do you think? http://www.garlic.com/~lynn/2011b.html#39 1971PerformanceStudies - Typical OS/MFT 40/50/65s analysed http://www.garlic.com/~lynn/2011b.html#89 If IBM Hadn't Bet the Company http://www.garlic.com/~lynn/2011c.html#3 If IBM Hadn't Bet the Company http://www.garlic.com/~lynn/2011c.html#4 If IBM Hadn't Bet the Company http://www.garlic.com/~lynn/2011f.html#80 TSO Profile NUM and PACK http://www.garlic.com/~lynn/2011g.html#29 Congratulations, where was my invite? http://www.garlic.com/~lynn/2011m.html#12 Selectric Typewriter--50th Anniversary http://www.garlic.com/~lynn/2011o.html#16 Dennis Ritchie http://www.garlic.com/~lynn/2012i.html#22 The Invention of Email http://www.garlic.com/~lynn/2012k.html#72 Any cool anecdotes IBM 40yrs of VM http://www.garlic.com/~lynn/2013b.html#61 Google Patents Staple of '70s Mainframe Computing http://www.garlic.com/~lynn/2013e.html#61 32760? http://www.garlic.com/~lynn/2013f.html#73 The cloud is killing traditional hardware and software http://www.garlic.com/~lynn/2013g.html#68 What Makes code storage management so cool? http://www.garlic.com/~lynn/2013h.html#9 IBM ad for Basic Operating System http://www.garlic.com/~lynn/2013n.html#60 Bridgestone Sues IBM For $600 Million Over Allegedly 'Defective' System That Plunged The Company Into 'Chaos' http://www.garlic.com/~lynn/2014.html#19 the suckage of MS-DOS, was Re: 'Free Unix! http://www.garlic.com/~lynn/2014b.html#59 write rings -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
