Recently I was working in a rack where the PDU's are two piece. One piece mounted in the middle of each side (almost unreachable) that then distributes power to smaller PDUs for the equipment at the rear. The connectors in the middle PDU point straight up and down. Those connectors have no strain relief so the only thing keeping them in is friction of the plug, the ones pointing down are at great risk. While installing additional hardware in the rack we bumped one and it fell out, dropping power to everything connected to it. Finding it, and connecting it again was a pain because you couldn't see the thing as there was equipment mounted on both sides. Luckily nothing important went down in this case but it could have!! And they have fork-lifts running by within 10 feet of these racks. That rumbling alone is going to cause them an outage one day....

- Larry

On 4/6/2011 11:18 PM, Pete Massiello wrote:
Rob is right on it here. I have seen some racks with no space in the back,
and the cables get all twisted together. Then when someone tries to slide
out a draw, something gets disconnected. What is the cost of that downtime?


Everyone has their favorite vendor, but sometimes you have to look beyond
the costs. The lowest cost rack isn't always the cheapest decision in the
long run. The best rack is the one which fits your needs.

Pete

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Pete Massiello
iTech Solutions
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-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Wednesday, April 06, 2011 9:41 AM
To: Midrange Systems Technical Discussion
Subject: Re: Article about IBM racks

We have multiple racks. One thing to consider is the space available
between the doors and the equipment. Some are so close that the doors are
just removed because you'll never get them closed without smashing cables.
Some aren't so bad. Some have enough space to accommodate either duct
work on the front and back, or, a rack mounted cooling unit. Without
direct cooling you may have to cool your room down to beer cold just to
get that thermometer hung on the inside of the rack down to a safe level.
It's an efficiency thing. Not that we used that knowledge when we just
put in new air handling equipment in our new computer room. (And that
special rack is still sitting empty in our lobby where it's been for the
last several years.)


Rob Berendt

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