[ale] How much wattage in my server?

[Doug McNash]

The initial spin up of the drives will cost you ~25W,
x16 = 400 watts unless you can stagger the spin up like 
you can do with SCSI.  With that number of drives you may 
need to calculate the number of 5V and 12V watts you need. 
 Once spinning you need only about half (~12W) to do a 
seek. I would WASG the MB/CPUs = 2 x 100W, 5W/card x 4 and 
20W for the video, thats 240W more plus a 20% safety 
factor puts you at 786W.

So we will say you need 800W. 



On Wed, 12 Feb 2003 10:17:16 -0500
  "Robert L. Harris" <Robert.L.Harris at rdlg.net> wrote:
>
>
>Ok, I've got a server with a dead power supply and am 
>trying to figure
>out what size of supply I need to replace it...
>
>Configuration:
>   Tyan 2466 Motherb board
>   dual AMD Athalon 1.8GHz
>   2x 8port 3ware IDE cards
>   16x 120Gig Maxtor Hard drives (yes, 16 drives)
>   Dual Nic (100bT and 100bT)
>   ATI VGA card
>   3 Case Mount Fans...
>
>I've never had to calculate the wattage needed for a 
>power supply
>before.  Is it just a count up the drives and hope 
>there's specs on them
>and then try to add up the various components the same 
>way?
>
>Robert
>
>   
>:wq!
>---------------------------------------------------------------------------
>Robert L. Harris                     | PGP Key ID: 
>E344DA3B
>                                          @ 
>x-hkp://pgp.mit.edu 
>DISCLAIMER:
>       These are MY OPINIONS ALONE.  I speak for no-one 
>else.
>FYI:
>  perl -e 'print 
>$i=pack(c5,(41*2),sqrt(7056),(unpack(c,H)-2),oct(115),10);'
>

--
Doug McNash
dmcnash at smyrnacable.net
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