On 04/04/13 07:12, Leon Towns-von Stauber wrote:
I've been in datacenters like that: single circuit per rack, maybe 15-
or 20-amp, maybe even 110V. (I'm thinking of a particular one in Fremont
right now....)
I don't consider that kind of power density acceptable these days. Two
or three 30A circuits per rack (or the equivalent) are needed to make
sufficient use of available space. They're not hard to find.
The data center I am at, I have provisioned 4x 20A 120V circuits (billed
as 2x HA pair) per rack for storage and 5x 20A 120V circuits for
compute. The fifth circuit was really because we need more outlets. The
compute rack contains 16x 1U servers, 5x 1U PDUs, 2x 1U switches, 1x 1U
IP KVM, 1x 2U patch panel. There is a 1U gap between all servers.
I use 1U remote switchable PDUs. I don't like the 0U (vertical) PDUs.
They get in the way of deep equipment and make dealing with dealing with
the rear of the rails.
I load every circuit to about 7A to 9A. This allows a circuit failure
to not blow its peer, as all equipment are dual homed for power.
At $JOB[-1] we had unbalanced power usage. Some circuits running 2A,
while its peer is at 22A (yes, it took awhile, but we did blow the
breaker a few times.) All equipment was single homed. So it took
downtime to rebalance, after getting a circuit usage report from data
center services. (We only had dumb PDUs.)
--
Mr. Flibble
King of the Potato People
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