Re: Power saving/spinning down RAID drives

From: P.T. Breuer (ptb_at_lab.it.uc3m.es)
Date: 10/19/04 

Date: Tue, 19 Oct 2004 10:35:26 +0200

Kamus of Kadizhar <yan@nsoesipnaemr.com> wrote:
> On Mon, 18 Oct 2004 11:08:44 -0400, Jean-David Beyer wrote:
>
> > My big machine has four 10,000rpm Ultra/360 hard drives and two 7,200 rpm
> > EIDE hard drives. But that is now where the power goes. The efficiency of
> > the 660 watt power supply is claimed to be 70%, so 925 watts go in and up
> > to 660 watts come out so around 275 watts go directly into heat (the rest
> > go indirectly into heat). The two 90 watt XEON processors put out the most
> > heat, though the E7501 chipset uses a lot of power too.
>
> Well, I turned on the server and the main workstation, both of which we
> kept on 24/7, and our power usage went from 300kWh/month to 600kWh/month.
> We can shut down the workstation during the day and at night, but I'd
> like to be able to do something with the server as well. Unfortunately,
> the server acts as answering machine, fax machine, email, etc. Ideally,
> I'd like to slow the CPU down along with the fans and the drives, but I
> don't think the machine will allow that.

Oh - I do that. It should allow it fine. I run a P3 1Gz underclocked to
750MHz (by downshifting the bus speed) without a fan, and with its
disks spun down, noatime set on all file systems, buffers set to stay
in memory an age and a half via bdflush, and running noflushd,
cpufreqd, powerd, etc.

In a desk drawer.

> I've thought about a ramdisk of
> some sort, but the RAM would cost more than it is worth.

Ram takes power. I just use 128M. I probably could do with another 64M.

Peter

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