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  1. #1

    Power consumption in rackmounted applications

    Hi there,

    I'm just curious: How do modern housing environments cope with those power hungry monster cpus?

    say, how many p4s or athlon64s fit in a normal rack? do you count by power supplies or is there a rule of thumb like 110 Volt multiplied with xyz Amperes divided by the Watt count of the power supplies?

    I can't imagine that a colocation hoster walks by his servers and measures their power consumption?

    Kind regards,
    Peter

  2. #2
    You can fit 42 1U servers in a 42U Cabinet if all you are putting in it is 1U servers.

    About power, it all depends. A rack or cabinet doesn't come with power, you have to add that to it. How much can you put? Well it's different for each location and power circuit.
    A power circuit with lots of output may be able to provide power to 42 servers, it all depends.

    How much power does each server take? Usually this is detailed in the technical server specification and varies from server to server. It's best to take a "worst case scenario" approach and assume your computers will be using full power consumption all the time so that you do not over-saturate your circuits.


    EDIT: BTW this post might get more response in the Co-location forum if a moderator wants to move it...
    Pierre Grandmaison
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  3. #3
    Join Date
    Jul 2002
    Posts
    1,441
    for 20 AMPs, you can fairly have 20 P4 Servers.
    Synergy Blue LLC
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  4. #4
    Join Date
    Jan 2005
    Location
    Chicago
    Posts
    226

    Re: Power consumption in rackmounted applications

    Originally posted by rygel
    Hi there,

    I'm just curious: How do modern housing environments cope with those power hungry monster cpus?

    say, how many p4s or athlon64s fit in a normal rack? do you count by power supplies or is there a rule of thumb like 110 Volt multiplied with xyz Amperes divided by the Watt count of the power supplies?

    I can't imagine that a colocation hoster walks by his servers and measures their power consumption?

    Kind regards,
    Peter
    Current is what's important, not power since crappy power supplies don't run at unity power factor. Measuring how much current a rack of servers is using isn't that peculiar or bad.

    It's usually safe to say a 1U server will use 1amp. Biggers servers use more if they have more drives or tons of stuff in them. Some huge 4 or 5 U SMP Xeon machines from dell use only 2-3amps, which is sort of surprising. Dual opterons in any form factor seem to be the biggest power hogs. 1U models always blow fire out the back.
    Ken

    CROWHOST hosting+colocation services | 877-CROWHOST | support at crowhost.com
    Independent remote-hands serving all Chicago data centers

  5. #5
    Join Date
    May 2002
    Location
    Manchester, UK
    Posts
    289

    Re: Power consumption in rackmounted applications

    Originally posted by rygel
    I can't imagine that a colocation hoster walks by his servers and measures their power consumption?
    you'd be surprised

    power usage is one of the biggest costs for us, we're actually spending the same on power, if not more, than our actual internet transit

    we reccon on about 16-20amps per rack which is enough for a reasonably high density of decent spec'd machines

    for example, over here in the UK in a large prortion of the datacentres, power comes in at between 50-80 per month, per 8 amps - up to $140
    Technical Director, M247

    Premium web and Internet infrastructure services from M247.com
    M247 is actively buying Helm3 customer base - cash waiting.

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