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Posted by on October 28, 2009, 11:53 am
On Wed, 28 Oct 2009 08:06:49 -0700, Smitty Two
>As far as the computer, those shouldn't be left on 24/7 anyway, for the
>health and longevity of the machine. I confess to being baffled by how
>that myth got created and so widely adopted.
It got started by an IBM study on MTBF on hard drives that found a
power off/on cycle was worth about 8 hours of running time.
Prior to that it was studies on light bulbs and fluorescent finding
similar results
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Posted by Stormin Mormon on October 28, 2009, 12:23 pm
If you pack 8 hours of electricity into a five minute
warmup, that's multiply by a factor of 96. Suppose my
computer draws 2 amps. Well, multiply that by 96 times, and
we're trying to draw 194 ampere rate, for five minutes. Is
that likely?
My computer warmup is less than five minutes, so we'd have
to draw about a thousand amperes, for a full minute.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
.
On Wed, 28 Oct 2009 08:06:49 -0700, Smitty Two
It got started by an IBM study on MTBF on hard drives that
found a
power off/on cycle was worth about 8 hours of running time.
Prior to that it was studies on light bulbs and fluorescent
finding
similar results
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Posted by on October 28, 2009, 1:22 pm
On Wed, 28 Oct 2009 12:23:44 -0400, "Stormin Mormon"
>If you pack 8 hours of electricity into a five minute
>warmup, that's multiply by a factor of 96. Suppose my
>computer draws 2 amps. Well, multiply that by 96 times, and
>we're trying to draw 194 ampere rate, for five minutes. Is
>that likely?
>My computer warmup is less than five minutes, so we'd have
>to draw about a thousand amperes, for a full minute.
>--
>Christopher A. Young
>Learn more about Jesus
> www.lds.org
>.
The study mentioned below had to do with wear and tear on the drive,
not power consumption.
How much is your down time and data loss worth?
This really came about over AS/400s where the loss of one drive meant
the loss of all data in that storage array because they used scatter
store across all drives at the same time..
>On Wed, 28 Oct 2009 08:06:49 -0700, Smitty Two
>It got started by an IBM study on MTBF on hard drives that
>found a
>power off/on cycle was worth about 8 hours of running time.
>Prior to that it was studies on light bulbs and fluorescent
>finding
>similar results
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Posted by Don Klipstein on October 29, 2009, 7:08 pm
gfretwell@aol.com wrote:
>On Wed, 28 Oct 2009 08:06:49 -0700, Smitty Two
>>As far as the computer, those shouldn't be left on 24/7 anyway, for the
>>health and longevity of the machine. I confess to being baffled by how
>>that myth got created and so widely adopted.
>It got started by an IBM study on MTBF on hard drives that found a
>power off/on cycle was worth about 8 hours of running time.
>Prior to that it was studies on light bulbs and fluorescent finding
>similar results
At one time, starting a fluorescent took something like an hour or two
off its life. Now it's more like 5-10 minutes, though probably longer
if it's used with an old fashioned "glow switch" starter that blinks it
afew times before getting it started.
As for incandescents - I'd like a cite for any of those studies saying
what you say. Although incandescents often burn out during cold starts,
cold starts do surprisingly little damage to most incandescents. What
happens is that an aging filament becomes unable to survive a cold start a
little before it becomes unable to survive continuous operation. The
condition that makes an aging filament unable to survive a cold start is a
hot thin spot in the filament - which worsens during operation at a rate
that accelerates worse than exponentially.
- Don Klipstein (don@misty.com)
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Posted by on October 30, 2009, 12:10 pm
On Fri, 30 Oct 2009 01:56:13 -0700, Smitty Two
> don@manx.misty.com (Don Klipstein) wrote:
>> gfretwell@aol.com wrote:
>>
>> >On Wed, 28 Oct 2009 08:06:49 -0700, Smitty Two
>> >>As far as the computer, those shouldn't be left on 24/7 anyway, for the
>> >>health and longevity of the machine. I confess to being baffled by how
>> >>that myth got created and so widely adopted.
>> >It got started by an IBM study on MTBF on hard drives that found a
>> >power off/on cycle was worth about 8 hours of running time.
>> >Prior to that it was studies on light bulbs and fluorescent finding
>> >similar results
>>
>> At one time, starting a fluorescent took something like an hour or two
>> off its life. Now it's more like 5-10 minutes, though probably longer
>> if it's used with an old fashioned "glow switch" starter that blinks it
>> afew times before getting it started.
>>
>> As for incandescents - I'd like a cite for any of those studies saying
>> what you say. Although incandescents often burn out during cold starts,
>> cold starts do surprisingly little damage to most incandescents. What
>> happens is that an aging filament becomes unable to survive a cold start a
>> little before it becomes unable to survive continuous operation. The
>> condition that makes an aging filament unable to survive a cold start is a
>> hot thin spot in the filament - which worsens during operation at a rate
>> that accelerates worse than exponentially.
>>
>> - Don Klipstein (don@misty.com)
>And I'd like to know when the hard drive study was done, and whether the
>current generation of drives has been subjected to any similar study. I
>personally doubt the validity of the original study. Anyway, there's a
>lot more going on inside a computer than a hard drive, and leaving it on
>all the time is unquestionably detrimental to the electronics.
Ther study was done at IBM Rochester in the 90s and primarily focused
on the 3.5" "Lightning" drive. Hard drives are the most likely thing
to fail in a PC and the thing that causes the most grief. (data loss
and extended downtime)
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>health and longevity of the machine. I confess to being baffled by how
>that myth got created and so widely adopted.