How would staggered drive start up work? Or is the array not available until the timer is done?
Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On May 15, 2016 1:01 AM, "Josh Reynolds" <[email protected]> wrote: > A lot of the dell servers I use, as well as a lot of the supermicro > servers have that as well. Thankfully many of the RAID JBOD cards I > use (softraid ftw, and zfs doesn't like it either) can also stagger > drive startup. > > On Sat, May 14, 2016 at 11:13 PM, Faisal Imtiaz > <[email protected]> wrote: > > 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. > > > > > > > > >
