G'day Rick,
I'm also interested in this in terms of 'real data' but taking a stab at answering this using available data.
The OSP 5.0 is specified to use 2 x 750W power supplies.
From what I can tell, these are actually redundant but distributed power usage (rather than aggregated) so the most power you should be pulling is 750W from a chassis.
If you specify that a drive uses 8W of power (at peak) and 6W (at idle) then you can approximate 45 drives are going to use 360W/270W.
360+360 = 720W (which doesn't leave much room at all for the motherboard, cpu, ram, cards, boot disk) so let's figure that in the event of PSU you aren't going to be able to run these flat out.
270+270 = 540W which leaves some room for the system overhead in the event of a PSU failure if the system is idle
If they are 4RUeach and you use 42RU racks, you could assume either 5 or 10 in a rack (20RU vs 40RU).
5 of these at approximately 700W would be 3.5KW or 7KW in a 'full' rack. This is relatively dense for a corporate/enterprise deployment but really no big deal for a HPC or otherwise specialised DC environment (we can see 20kW+ in some racks).
It'd be interesting to see how far out I am from projected figures and assumptions compared to the reality.
In summary:
Around 700W per unit average use?
7KW per rack (10 pods)
14kW per 'Vault" (20 pods)
at $0.3 per kWH
$5 per pod, per day (180T raw storage)
$1840 per pod, per year (365 days)
$50 per rack, per day (1.8P raw storage)
$18,400 per rack, per year
$100 per vault, per day (3.6P raw storage)
$38,800 per vault, per year
If i'm out by a factor of 2 (i.e i've underestimated the actual power draw by 50%) then double every figure of course..
If you work backwards from BB having > 100P (assuming raw), that's almost 30 vaults worth.. or a power bill in the order of $1.2m/year
At which point, if you can figure out a way to save 10% on your power you are making reasonable savings.. (without even thinking about carbon costs on top of this as well).
regards,
-jason
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