A little humor ... Years ago I worked for LEXIS-NEXIS, which has an enormous data center housing many mainframes, Sun servers, etc. Backup power was provided by onsite diesel generators which, of course, needed periodic testing.
One smart alec manager put in a purchase order for a "Diesel Fuel Testing Device" for something like $75,000. His manager, all too trusting, signed off on ... the purchase of a Mercedes Benz. Needless to say, the car wasn't purchased. Jeff Hitchcock - [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Doug Traylor Sent: Tuesday, February 15, 2005 11:38 PM To: [email protected] Subject: Re: [IMail Forum] OT: hardware company > I never understood why a manufacturer would have an option to use a single > power cord to connect to a power supply with two redundant power supplies in > the same server. if someone trips over the single cord, as in the example > below, then both supplies go down. Re: the redundant power supplies, there are two power cords, one for each side. Only one was inadvertently disconnected. It was a fluke as we could not reproduce the corruption on subsequent weekend testing. Go figure. Dual UPS's, now that's redundant. :o) I remember the UPS we had for our IBM Mainframe and computer room many years ago. Very high tech, ridiculously expensive stuff, cost us a cool million if I was told correctly. Never saw the bill of sale. Easy to believe tho as it had it's own room. Gave us up to 35-40 minutes to shut down the computers, drives, etc. as long as both battery chains did not have a dead cell. The two first times we needed it, one chain was dead so we got about 90 seconds after the lights went off. Fun stuff. Lost drive packs, the whole deal. Ah memories. After implementing a periodic battery removal, load test, and then replacement procedure we never had another problem with that monster. Each battery only lasted about 6 months and cost many hundreds of dollars. Doug Traylor On Tue, 15 Feb 2005 21:45:51 -0600, Bruce Barnes <[EMAIL PROTECTED]> wrote: > re: redundant power supplies. > > > why not have all servers with dual power supplies connected to seperate UPS > units so that if either the power supply fails, the UPS fails or the circuit > to which the UPS is connected fails, the redundant power supply can take > over. > > i know, many people would consider that kind of redundancy redundant, but we > do not, too many strange thing have happened. i'd rather spend the money on > prevention than waste a day "fixing" something that could have been > prevented while 50 angry office workers and untold numbers of customers are > screaming at me on the telephone and thru the doorway about the fact they > can't get the pictures that their grandkids sent them via e-mail. > > Bruce Barnes To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
