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Forum: Data center general discussion and solution 09-02-2011, 12:19 AM
Replies: 4
Views: 4,910
Posted By Zitibake
3-year-olds? (just kidding) There are...

3-year-olds?

(just kidding)

There are solar/wind companies pitching to datacenters:
"We will build a solar array/wind farm next-door to your DC, if you promise to buy all the power we can...
Forum: Data Center Design, Development, Building Systems and Operations 09-01-2011, 01:50 AM
Replies: 2
Views: 3,168
Posted By Zitibake
As followup: I was considering trying to...

As followup: I was considering trying to "profile" the unused PDUs (e.g. take Dranatz logs of the feeder, during inrush and then PDU steady state... maybe even with a load-bank on ), so that when...
Forum: Data Center Design, Development, Building Systems and Operations 03-12-2011, 04:26 PM
Replies: 2
Views: 3,168
Posted By Zitibake
power-down unused PDUs/transformers?

I have a number of PDUs in a datacenter which were installed and commissioned to support future growth. But at present, they are just consuming power and creating heat. We're considering powering...
Forum: Data center general discussion and solution 08-29-2010, 08:25 PM
Replies: 4
Views: 4,073
Posted By Zitibake
Thanks, Ken. The safest practice may be to...

Thanks, Ken. The safest practice may be to bypass the whole UPS cluster (on generator, of course), when maintaining either UPS. That said, I have executed this bypass in facilities where A and...
Forum: Data center general discussion and solution 08-28-2010, 04:38 AM
Replies: 4
Views: 4,073
Posted By Zitibake
2N power, with clustered-N?

I've seen a handful of datacenters, run by different companies, claiming "2N power", where two "power rooms" or "UPS rooms" labeled "A" and "B", power the servers; and where each of the two UPS rooms...
Forum: Data center general discussion and solution 08-28-2010, 04:23 AM
Replies: 7
Views: 5,492
Posted By Zitibake
I read through the Siemon brochure. It states: ...

I read through the Siemon brochure. It states:

.

...so that seems to support my old manager's assertion, that Cat5E was the "oops" release, to support GigE at "worst case" cable path. And...
Forum: Data center general discussion and solution 08-28-2010, 03:50 AM
Replies: 7
Views: 5,492
Posted By Zitibake
The way my old datacenter manager described it: ...

The way my old datacenter manager described it:
- Gigabit Ethernet was designed to work over the pre-existing Cat5 cable plant.
- There were some cases where Cat5 didn't work for GigE, especially...
Forum: Data center general discussion and solution 04-06-2010, 06:12 AM
Replies: 3
Views: 2,511
Posted By Zitibake
I've seen hot glue and I've seen epoxy. And some...

I've seen hot glue and I've seen epoxy. And some strips have honest cable-retention clips (such genius, I hope they patented that!).
Forum: Data Center Design, Development, Building Systems and Operations 02-23-2010, 03:46 AM
Replies: 1
Views: 3,481
Posted By Zitibake
I found a relevant recommendation: "Engine...

I found a relevant recommendation:

"Engine generators for Tier III and IV sites" (my situation) "shall not have a limitation on consecutive hours of operation when loaded to 'N' demand."

I note...
Forum: Data Center Design, Development, Building Systems and Operations 02-22-2010, 10:25 PM
Replies: 1
Views: 3,481
Posted By Zitibake
genset capacity and datacenter standards

I have seen descriptions of the Tier-3 datacenters, as having power systems which are N+1, and sized to support "90% N" (versus 100% of "N" for Tier-2).

Does anyone know how to translate that for...
Forum: Data Center Prodcuts Reviews, Tools, Tips and Check List 11-13-2009, 02:05 AM
Replies: 2
Views: 2,616
Posted By Zitibake
I have low-voltage certified and BICSI people...

I have low-voltage certified and BICSI people on-staff. But there are always datacenter tricks that they don't teach at the union hall. For example, basket tray (e.g. Snaketray) tricks are...
Forum: Data Center Prodcuts Reviews, Tools, Tips and Check List 09-18-2009, 09:51 PM
Replies: 2
Views: 2,616
Posted By Zitibake
pulling twisted pair cable through trays?

Does anyone use tricks to pull twisted-pair cables through under-floor cable trays, without pulling all the floor tiles? I was thinking about using some pull-string in a continuous loop, which runs...
Forum: Data center general discussion and solution 09-18-2009, 09:18 PM
Replies: 1
Views: 2,104
Posted By Zitibake
Try laser

I think you'd need Free Space Optical laser (search for "FSO gigabit") to achieve those kinds of speeds; but haven't seen anything that can run 0.75 miles. For example, MRV Terescope 1000g claims...
Forum: Data Center Design, Development, Building Systems and Operations 08-29-2009, 05:34 PM
Replies: 0
Views: 1,977
Posted By Zitibake
motorized breakers in MBP?

I operate some UPSes with maintenance bypass panels; in some cases, there are kirk-key interlocks which prevent operation without the UPS in bypass; and which prevent flipping the breakers out of...
Forum: Data Center Design, Development, Building Systems and Operations 01-10-2009, 11:24 PM
Replies: 0
Views: 2,375
Posted By Zitibake
change in ASHRAE humidity

ASHRAE has switched from using relative humidity to absolute humidity. The new "recommended" is dew-point between 41.9 degrees F and 51F. Anyone know what the new "acceptable" range is for...
Forum: Data Center Design, Development, Building Systems and Operations 08-31-2008, 09:33 PM
Replies: 2
Views: 3,479
Posted By Zitibake
In case anyone is curious, I'm spec'ing the Telco...

In case anyone is curious, I'm spec'ing the Telco Entrance Facility to be NFPA-76-compliant, rather than NFPA-75. Power in the TEF is via EMT rather than nonmetallic liquid-tight. There are no...
Forum: Network and Telecom Forum 06-25-2008, 01:17 AM
Replies: 17
Views: 12,728
Posted By Zitibake
When you're sufficiently multi-homed, you can...

When you're sufficiently multi-homed, you can adjust for carrier events as necessary. But one thing that can limit the amount of adjusting you need to do, is support for traffic engineering via BGP...
Forum: Data Center Design, Development, Building Systems and Operations 06-24-2008, 01:57 AM
Replies: 2
Views: 3,479
Posted By Zitibake
DC batteries in Telco Entrance Facility

Telco carriers really like to deploy -48v DC batteries within their racks in the telco room ("Telco Entrance Facility" for TIA-942). NEC 645-10 requires that if you use NFPA exemptions for the...
Forum: Network and Telecom Forum 05-16-2008, 06:09 PM
Replies: 0
Views: 2,665
Posted By Zitibake
financing for fiber build and IRU purchases

Anyone who has done private fiber builds and/or purchased IRUs of strand facility of wavelength facility: what avenues are productive for financing? I doubt that either new builds or IRUs are...
Forum: Data Center Design, Development, Building Systems and Operations 03-20-2008, 03:50 AM
Replies: 7
Views: 12,718
Posted By Zitibake
Anyone have suggestions for hot or cold aisle...

Anyone have suggestions for hot or cold aisle width if you intend to use in-row or overhead cooling?
Showing results 1 to 20 of 113

 
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