RE: when a ups doesn't help

We run 4 UPS' in our server room.  Mostly because we out grew one and
kept adding.  I am hoping to replace 3 really old ones with one big new
one.  Any how our room is divided in to 3 rows of racks, one is Intel
equipment on 4 racks powered by one UPS.  The second row is all Telco on
it's own UPS.  The third has one UPS dedicated to running half of our
online transaction processing system that we sell to merchants for Point
of Sale transaction processing, (which runs on an AS400).  The other
half is our big AS400 that runs all of our back office applications etc.
It also runs the other half of our OLTP.  We use two UPS' so if one
fails, we still have half the equipment running and can switch that half
to the running AS400.  (Our Big one also runs our OLTP.)

Best scenario is to have 2 UPS' both running power to a rack with each
device having 2 power supplies, one plugged in to each UPS.  If your
AS400 has redundant power supplies, you can plug each into a separate
UPS, at least on most of the older equipment I have dealt with.


Christopher Bipes
Information Services Director
CrossCheck, Inc.

707.586.0551, ext. 1102
707.585.5700 FAX

Chris.Bipes@xxxxxxxxxxxxxxx
www.Cross-Check.com

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-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim Franz
Sent: Wednesday, February 22, 2006 6:50 AM
To: MIDRANGE-L@xxxxxxxxxxxx
Subject: when a ups doesn't help

Had a customer plug a monitor power cord into same rack power strip
that i5 was plugged into. This is a regular professional rack with built
in power
strips. The whole rack, with i5, is covered by a large ups. Power strip
"blinked" (some 
kind of electrical short) and next thing we know, i5 is IPLing. The
system value
is set to re-ipl when power restored, so it did. Came up fine, but
management 
asking how to avoid this. 
Is it common to use a large ups for multiple equipment,
or do most shops with comm, wintel servers, and i5 isolate the i5 on a
separate ups? 
(and that ups would have to be within power cord distance from server)