cfmpub...@ns.sympatico.ca (Clark Morris) writes: > On a logical basis I agree with you but has the 24/7/365 shortcut for > continuous availability become so pervasive that it is the shorthand > way for saying it and is it the way that the general public as opposed > to us professional nitpickers best understands it?
when we were doing ha/cmp in the early 90s, one of the customers we called on supported the 1-800 lookup (i.e. 1-800 got routed to dbms transaction that looked up the "real" number for putting the call through) & had "five-nines" availability. the incumbent had redundant hardware ... but required system to be taken down for software maintenance ... short scheduled downtime, once a year blew the outage budget for a nearly a century. ha/cmp didn't have redundant hardware components but had replicated systems and fall-over ... so failures & downtime was masked ... even rolling outages for software system maintenance w/o service impact. eventually the incumbent vendor came back and said that they could do replicated systems also ... for masking individual system downtime ... but that negated the requirement for redudant sofware. i was then asked to write a section for the corporae continuous available strategy document ... but the section got pulled after both Rochester and POK complained that they couldn't meet the objectives. past posts mentioning coining the terms "disaster survivability" and "geographic survivability" ... to differentiate from disaster/recovery when out marketing ha/cmp: http://www.garlic.com/~lynn/submain.html#available -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
