Extra wide cabinets are awesome for cable management.
On Thu, May 19, 2016 at 12:42 PM, Paul Stewart <p...@paulstewart.org> wrote: > The cabinets are 50 or 52U in size – custom size I know for sure… extra wide > too which is nice > > > > When filled (pure SSD, almost 200TB raw capacity) they draw around 16kW of > power J > > > > > > From: Af [mailto:af-boun...@afmug.com] On Behalf Of Eric Kuhnke > Sent: May 14, 2016 7:50 PM > To: af@afmug.com > 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" <p...@paulstewart.org> 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:af-boun...@afmug.com] On Behalf Of Eric Kuhnke > Sent: May 11, 2016 5:15 PM > > > To: af@afmug.com > 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 <af...@kwisp.com> 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: af@afmug.com > > 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 <lesm...@ecsis.net> 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 > lesm...@ecsis.net > > > > > > -- > > 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. > >
