Re: How much?

["Brendan" <jbh@xxxxxxx>]

Nigel,

What are your views in this context re thermal shock experienced by turning
on and
off the kit ?

Brendan

-----Original Message-----
From: Nigel Orr <nigel.orr@xxxxxxx>
To: ukha_d@xxxxxxx <ukha_d@xxxxxxx>
Date: 16 December 1999 09:36
Subject: [ukha_d] Re: How much?


>At 22:04 15/12/99 -0000, you wrote:
>>Does anyone have any info on how much it costs, per day to leave a
PC (not
>>the monitor) on 24/7?
>
>Typical power supplies are about 200W-300W, so probably about 350W
absolute
>peak with a bundle of drives running continuously.  I would expect,
from
>measuring the power drawn by our machines in the past, that it would
>average around 100W or less in typical use, and a bit less if the
drives
>spin down, or there are other power saving measures.  Probably 50W over
a
>week's measurements?  It depends critically on the processor- if you
are
>running a 486 or Pentium under 100MHz, the power will be lower than
>something running at 600MHz or more!
>
>Guesstimating electricity costs at 7p/kWh, that would be about 9p per
day.
>Bear in mind that the power is almost all given off as heat, so if you
want
>to be fair about it, the 100W will mean less power required from your
>heaters...
>
>I tend to leave my linux machines up continuously (except when they are
in
>pieces on the floor ;-) ).  Windows machines are best rebooted
occasionally
>to recover any 'leaked' resources or memory, so might as well be
switched
>off when not in use for a day or two.
>
>Nigel
>
>
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