[mythtv-users] Backend hardware advice - RAID suggestions

[John Drescher]

I see a big problem with these calculations. You are assuming that the
system is not running any type of power saving mode. For current
athlon64/opteron processors with cool and quiet running the processor will
consume around 25W.

Also at work I have an opteron 248 server with 4GB of PC3200 ECC DDR, dual
processor board, 2 power supplies and 18 X 250 GB  WD SATA drives and the
entire system draws ~300W under full load as reported by the apc ups that it
is connected.

John

On 7/16/06, Brad Templeton <brad+myth at templetons.com> wrote:
>
> On Fri, Jul 14, 2006 at 08:03:08PM -0700, dave johnson wrote:
> > -11x200GB Seagate 7200.8 PATA HD ($43/ea - massive tripple-rebate
> coupon-hell at Fry's and a lot of
> > trust-worthy friends.  It took almost 3 months to get the rebates and
> one was denied because I
> > probably filled one out wrong, so add $70 for "my mistake." ;)
>
>
> How many watts are these drives?   Typically one sees 7 to 15w for such
> drives (slower
> drives, 4500 or 5400 rpm are usually better - quieter, cooler, lower
> power, longer life).
>
> With your two PSs how much power are you drawing for the whole
> system?  200 to 300
> watts?  More?
>
> In California (you said you went to Fry's) incremental power has gotten up
> to 19 cents/kwh.
>
> That means 300 watts, running 24/7 costs $500 per year.   (In winter you
> save a bit
> from the heat it gives you, but not a lot.  In summer you may be paying it
> back
> in AC costs if you need AC.)
>
> Even in places with cheaper 10 cent/kwh power, it's still almost $250 per
> year for
> the power.
>
> Forget about the damage to the environment, 11x200gb is just a bad way to
> do it
> from an economic standpoint.    They have 500gb drives in Fry's for $175 I
> think.
>
> So 5x500gb could do 2 TB RAID-5 if you really need RAID (you don't in my
> view, this is
> not a system that needs 100% availability) for a bit more money ($875 for
> drives vs.
> $540 for the 11x200gb without doing rebates, and without 2 power supplies.
>
> But more to the point it would draw a lot less power, and make up the
> difference
> in a year or so.   Quieter and smaller too.
>
>
> > Never under estimate the power of the K.I.S.S. method :)
>
> Never forget that power is becoming the most expensive component of any
> always-on PC,
> especially in California and other places with expensive power.
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