One more thing. Geographical redundancy is a good thing. -brian
On 7/27/07, Brian Gupta <[EMAIL PROTECTED]> wrote: > > You want enough battery time to start the generators, and fix the > generators and pumps that may possibly fail. (And you definately want to > make sure you have redundant fuel pumps for each generator.) > > Also quarterly testing is a must. > > --brian > > On 7/27/07, Bill Sommerfeld <[EMAIL PROTECTED]> wrote: > > > > On Tue, 2007-07-24 at 22:20 -0700, Hugh McIntyre wrote: > > > > > http://www.prnewswire.com/cgi-bin/stories.pl?ACCT=104&STORY=/www/story/07-24-2007/0004631109&EDATE= > > > > > > > > In answer to the questions about backup power, obviously they have UPS > > > and generators (as the press release says...). > > > > There is more detail available here: > > > > http://www.365main.com/status_update.html > > > > Looks like they had 8 primary and 2 secondary generators - N+2 > > redundancy. > > > > They lost 5 -- 4 failed to start, and another was overloaded into > > failure due to the first 4 failures. > > > > At first, three primary and one secondary generator failed to come up. > > > > It appears there was sufficient capacity in the remaining secondary > > generator to handle the load of two of the primaries, but not three, so > > the running secondary generator *also* fell over. > > > > As a result, three of their eight rooms lost power for about 45 minutes; > > a fourth room lost power for half a second due to some sort of PDU > > glitch. > > > > - Bill > > > > > > > > > > > > _______________________________________________ > > opensolaris-discuss mailing list > > [email protected] > > > >
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