On 7/7/2011 5:32 PM, Matt Lawrence wrote:
On Thu, 7 Jul 2011, Eric Sproul wrote:
I'd also add that for heterogeneous equipment, favor putting equipment
with similar rack depth together. There's nothing worse than having a
short 1U server sandwiched between two deeper ones and not being able
to get your hand in there to fiddle with cables and such. It's also
an airflow no-no, as the outflow from the short server will tend to
warm up the chassis above and below it.
Very true. But I tend to consider the 1U form factor to be a bad idea
for computers anyway.
Speaking of airflow, what's the feeling on blanking panels? Does it
matter only "at scale", i.e. more than 2-3 racks in a small room, or
is it always a good idea? The profit margins on what is basically a
chunk of painted sheet metal are rather insulting...
I've been known to buy sheets of "acrylic glazing" and make my own.
We use them extensively, but have to do get the density we want. We are
spec'd for up to 25KW per rack, and you can't have that without
separation of cold and hot, and that means complete separation. We use
bulk mouse pad material to drape above the racks at the partition
between the space, and foam to put in uneven spots, between, and under
racks. Blanking panels are a must for us. Yes, they run about $8 ea. for
1U, but the bigger the space, the cheaper per unit. There are many
sellers of the middle atlantic version of them which are cheaper than
the APC ones.
IMO, separation is always a good idea. A colo like equinix doesn't have
it and so they can only get 4-6KW (8 if really pushed) per rack, and the
PUE is somewhere around 2 to 2.5. We have a PUE of about 1.3. Yahoo and
google have different datacenters that are close to unity (free cooling).
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