It would be interesting to note that, we are putting in some new servers, and in the bios these have a setting that delays a random amount of time between 50 - 120seconds, before returning to power on state after a power loss .....
:) Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: [email protected] > From: "Chuck McCown" <[email protected]> > To: [email protected] > Sent: Saturday, May 14, 2016 11:40:09 PM > Subject: Re: [AFMUG] Data center temperatures > I remembering being at a data center on a hot summer day. Power went out, > generator started. Things were fine... then all the air conditioners switched > on at the same time. Actually stalled the generator. We had to put sequencers > on the AC. > From: Faisal Imtiaz > Sent: Saturday, May 14, 2016 9:20 PM > To: [email protected] > Subject: Re: [AFMUG] Data center temperatures > FYI, Electrical Code (NECA) and most datacenters require the power not to be > loaded beyond 80% of breaker capacity... i.e. 16amp draw on a 20amp circuit. > Additionally, one also has to have head room on the power circuit to deal with > start up draw (current rush). It's not pretty when you have a crap load of > servers starting up all together > :) > Faisal Imtiaz > Snappy Internet & Telecom > 7266 SW 48 Street > Miami, FL 33155 > Tel: 305 663 5518 x 232 > Help-desk: (305)663-5518 Option 2 or Email: [email protected] >> From: "Eric Kuhnke" <[email protected]> >> To: [email protected] >> Sent: Saturday, May 14, 2016 7:50:22 PM >> Subject: Re: [AFMUG] Data center temperatures >> How does a 44U cabinet need 208V 60A for storage arrays? >> In a 4U chassis the max hard drives (front and rear) is about 60 x 3.5"... >> Say each drive is 7.5W TDP, that's 450W of drives. Add another 200W for >> controller/motherboard and fans. 650W in 4U. >> 44 / 4 = 11 >> Multply by 650 >> 7150W >> More realistically with a normal amount of drives (like 40 per 4U) a single >> 208 >> 30A is sufficient, >> 208 x 30 = 6240W >> Run at max 0.85 load on the circuit, so >> 6240 x 0.85 = 5304W >> In a really dense 2.5" environment all of the above is of course invalid, you >> could probably need up to 7900W per cabinet >> Then there's 52U cabinets as well... >> On May 13, 2016 6:16 PM, "Paul Stewart" < [email protected] > wrote: >>> Yup … general trends on new data centers are pushing those temperatures >>> higher >>> for efficiency but also with better designs .. >>> One of our data centers runs at 78F and have no issues – each cabinet is >>> standard 208V 30A as you mention but can go per cabinet much higher if >>> needed >>> (ie. 208V 60A for storage arrays) >>> From: Af [mailto: [email protected] ] On Behalf Of Eric Kuhnke >>> Sent: May 11, 2016 5:15 PM >>> To: [email protected] >>> Subject: Re: [AFMUG] Data center temperatures >>> There have been some fairly large data set studies done shown that air >>> intake >>> temperature for huge numbers of servers, at 77-78F does not correlate with a >>> statistically significant rate of failure. >>> http://www.datacenterknowledge.com/archives/2008/09/18/intel-servers-do-fine-with-outside-air/ >>> http://www.datacenterknowledge.com/archives/2012/03/23/too-hot-for-humans-but-google-servers-keep-humming/ >>> how/what you do for cooling is definitely dependent on the load. Designing a >>> colo facility to use a full 208V 30A circuit per cabinet (5.5kW) in a >>> hot/cold >>> air separated configuration is very different than 'normal' older facilities >>> that are one large open room. >>> On Wed, May 11, 2016 at 1:58 PM, Ken Hohhof < [email protected] > wrote: >>>> I’m not sure you can answer the question without knowing the max heat load >>>> per >>>> cabinet and how you manage airflow in the cabinets. >>>> AFAIK it used to be standard practice to keep data centers as cold as >>>> possible >>>> without requiring people to wear parkas, but energy efficiency is a >>>> consideration now. >>>> From: That One Guy /sarcasm >>>> Sent: Wednesday, May 11, 2016 3:51 PM >>>> To: [email protected] >>>> Subject: Re: [AFMUG] Data center temperatures >>>> apparently 72 is the the ideal for our noc, i set our thermostat to 60 and >>>> it >>>> always gets turned back to 72, so i just say fuck it, I wanted new gear in >>>> the >>>> racks anyway >>>> On Wed, May 11, 2016 at 3:46 PM, Larry Smith < [email protected] > wrote: >>>>> On Wed May 11 2016 15:37, Josh Luthman wrote: >>>>> > Just curious what the ideal temp is for a data center. Our really nice >>>>> > building that Sprint ditched ranges from 60 to 90F (on a site monitor). >>>>> I try to keep my NOC room at about 62F, that puts many of the CPU's >>>>> at 83 to 90F. Many of the bigger places I visit will generally be 55 to >>>>> 60F. >>>>> Loads of computers (data center type) are primarily groupings of little >>>>> heaters... >>>>> -- >>>>> Larry Smith >>>>> [email protected] >>>> -- >>>> If you only see yourself as part of the team but you don't see your team >>>> as part >>>> of yourself you have already failed as part of the team.
