The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main,alt.folklore.computers as well.
lba...@bellatlantic.net (Alex UMX) writes: > Well, 99.999% reliability means that 1/10000 of the time the thing is not > reliable = about 8 hours per year. > Not to confuse with z/VM reliability that was 99.999999 if I recall it > correctly > back in 1991 or so for VM/ESA 1.0. about that period, we marketed ha/cmp for 1-800 against stratus. at the time stratus took down system for software maintenance (would have outage that precluded even five-nines). ha/cmp could have fall-over between multiple servers as part of maint. strategy ... limiting outage to few seconds. the response was that then stratus could install multiple servers in (software fall-over) HA configuration ... to eliminate maint. outage window. the response was then why spend for the hardware redundancy as an aside their box was also being relogo'ed and marketed as the S/88. this recent post http://www.garlic.com/~lynn/2009p.html#85 Anyone going to Supercomputers '09 in Portland has some old "marketplace news" abstracts (29jun92) mentioning remarketing branded stratus box ... the article might have a misstatement ... the amount was what was paid for the program ... not that much was actually sold. as an aside ... i believe FAA has had some number of Flex-ES installations (running mainframe software on intel platforms) ... old post mentioning Flex-ES also available on stratus boxes http://www.garlic.com/~lynn/2003d.html#10 Low-end processors (again) for random other drift ... recent posts about old Jim Gray paper that by early 80s, majority of outages had shifted from hardware faults to other things http://www.garlic.com/~lynn/2009.html#5 Is SUN going to become x86'ed ?? http://www.garlic.com/~lynn/2009.html#39 repeat after me: RAID != backup http://www.garlic.com/~lynn/2009.html#47 repeat after me: RAID != backu including scan of old copy of a version of presentation that I had laying around ... and put up on the web: http://www.garlic.com/~lynn/grayft84.pdf I've mentioned before Jim and I had something of dust-up at acm sigops in '91 about whether commodity components could be used for HA operation ... he was still at DEC and their party-line was vax/cluster. later when he moved to m'soft ... he was up on stage for the announcement of m'soft HA fallover product. -- 40+yrs virtualization experience (since Jan68), online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
