This is the headache I find myself with. Air Con was already in the
"server room" when they moved in. No one was monitoring temperatures
before I got there (pretty much no resource monitoring, mostly just
ports and pages). Added it in and thought it was a little warm over the
weekend but not significant enough to concern me. Then came the first
holiday weekend and I merrily watched temperatures climb and climb. By
the end of 3 day we were into rather alarming levels. Being in Hawaii
in a sunwards facing 30 story building with large windows also doesn't help!
The problem is our aircon unit pushes our hot air into the main AC ducts
on the floor. Come out-of-hours time those ducts become mostly static
apart from the little push from our AC. It's okay for a while but the
heat just builds up and builds up until the building AC is next on. It
took a little juggling for a while for me to get us down to the right
numbers of servers. Theoretically the AC unit we've got can produce
enough cooling to cope with everything we have, but not when its outflow
doesn't go anywhere.
Thankfully it's all dev servers but I suspect more than a few hardware
failures I've seen will have not been helped by the excess heat of a
holiday weekend.
We're set to expand our office and building maintenance are hot (if
you'll forgive the pun) on fixing our AC problem. All that hot air in
the duct causes them problems too.
Paul
On 11/23/2010 1:24 PM, Jake Mohnkern wrote:
It may seem obvious but make sure you can get AC after hours. In our
building we have HVAC that shuts off at night. While I have complete
control over my own server room unit I cannot count on any airflow
being maintained after hours to my telco closet. The building owners
won't leave a rooftop unit on just for us so I needed to make other
arrangements.
Since the heat load in the closet is fairly low, I just took a 12 inch
fan from an old rack and used it to blow the warm air up into the
plenum. Ejecting the stagnant air and drawing fresh air in under the
door is enough to keep that room within an acceptable range.
-jake
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