Re: How much?

["Brendan" <jbh@xxxxxxx>]

Thanks Chris

B
-----Original Message-----
From: Chris Davenport <chris@xxxxxxx>
To: ukha_d@xxxxxxx <ukha_d@xxxxxxx>
Date: 16 December 1999 11:06
Subject: [ukha_d] Re: How much?


>Brendan,
>
>In my experience with non-PC equipment, blown power supplies used to
>be a problem when we switched equipment off when not in use.  Since
>we shifted to 24/7 operation we haven't blown a single PSU.  Switched
>mode PSU's seemed to be particularly susceptible to this kind of
>failure.
>
>On the subject of electricity costs we recently removed an old storage
>heater from our computer room at work as the waste heat from all the
>computers meant it hadn't been used for years.  Of course the
electricity
>used to run the computers at night is more expensive than the Economy 7
>used to run the old heater AND we have to run air-conditioning in the
>summer months too.  So 24/7 can get expensive.  Now I wonder if we
>could run the computers on Economy 7 at night...?
>
>Chris.
>
>---------- Original Message ----------
>From   : "Brendan" <jbh@xxxxxxx>
>To     : <ukha_d@xxxxxxx>
>Date   : Thu, 16 Dec 1999 09:51:46 -0000
>Subject: [ukha_d] Re: How much?
>>
>>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
>>>
>--
>Chris Davenport
>chris@xxxxxxx
>
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