In the message dated: Wed, 03 Apr 2013 13:46:03 -0500,
The pithy ruminations from Matt Lawrence on
<[lopsa-tech] High density servers> were:
=> This is a bit of a rant, so adjust your filters accordingly.
=>
=> I'm currently doing some work not really production datacenter (unless you
=> ask the developers) that has a variety of systems. Some of the systems
=> I'm dealing with are the 4 servers in 2U variety. It's a neat idea, but
=> great care needs to be taken to avoid problems. One of the big issues is
=> cable density, the systems I'm managing have a BMC connection, 2x 1Gb
=> connections, 2x 10Gb connections and a KVM dongle. That's 7 things
=> plugged into the back of each server (KVM is VGA + USB). Multiply times 4
=> and that's 28 cables per 2U, plus 2x power cables. That's a lot of cables
=> and they aren't running in neat rows like a 48 port switch.
Yep.
[SNIP!]
=>
=> Right through that rat's nest of cabling. It's a challenge. If you
=> consider yourself ok at cabling, you don't have anywhere near the skills
=> to do cabling at this density. Typical cabling standards are not adequate
=> for these kinds of setups. Mediocre cabling also really blocks the air
Good observation.
Can you (or anyone else) contribute [links to] photos and/or guidelines on
good ways to deal with this level of cabling?
We've all seen stuff like the 'before' picture here:
http://www.energystar.gov/index.cfm?c=power_mgt.datacenter_efficiency_airflow_mgmt
But I rarely see good examples of server cabling (network racks are often much
better). If possible, I'd hire an old telco guy to do cabling, but that's not
really an option.
This looks like a good choice for ethernet:
http://www.newark.com/pdfs/techarticles/blackbox/datacentercable-flyer_11-07.pdf
[SNIP!]
=>
=> This concludes my rant for today. Maybe.
No rush, it's still early. :)
Mark
=>
=> -- Matt
=> It's not what I know that counts.
=> It's what I can remember in time to use.
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