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Date:      Sun, 6 Feb 2005 14:01:15 +0100
From:      Mark Rowlands <mark.rowlands@mypost.se>
To:        freebsd-questions@freebsd.org
Cc:        Anthony Atkielski <atkielski.anthony@wanadoo.fr>
Subject:   Re: Leaving a Computer Running ?
Message-ID:  <200502061401.20967.mark.rowlands@mypost.se>
In-Reply-To: <1088851878.20050206122453@wanadoo.fr>
References:  <200502051745.25937.hindrich@worldchat.com> <LOBBIFDAGNMAMLGJJCKNAEEHFAAA.tedm@toybox.placo.com> <1088851878.20050206122453@wanadoo.fr>

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On Sunday 06 February 2005 12:24, Anthony Atkielski wrote:
> Ted Mittelstaedt writes:
>
> TM> In a clean room or positive pressure network room, where there is
> TM> an extremely low level of dust, off-the-shelf computer fans will
> TM> last many years longer than fans in a typical home PC.
>
> What about filters?  On my current FreeBSD server (not in a clean room,
> alas!), the fans that I installed have washable plastic filters, which
> removes part of the dust.  I'd love to find disposable filters that
> capture more dust and can simply be tossed at regular intervals.
> Ideally, they wouldn't interfere with airflow too much, but I realize
> that catching all dust and maintaining airflow are almost mutually
> exclusive.

I use my gfs tights.......  christ...  I hope she's not subscribed here as 
well
>
> Currently I have two 8-cm fans blowing directly past the disk drives, in
> order to keep them as cool as possible (not that the drives are that
> busy, but I'm trying to be prudent).
>
> TM> For PC's left on for long periods, they have a different problem
> TM> because disk drives that spin at full speed continuiously (as
> TM> server drives do, servers have power saving disabled on their
> TM> drives of course for obvious reasons) the disk will eventually
> TM> overheat in just about all the garden-variety case designs.
> TM> (you can fix this yourself of course, by adding more fans to
> TM> the cases)  Once the drive overheats the lubrication migrates
> TM> out of the bearings and if the drive is turned off for more
> TM> than 6-8 hours, it cools down enough to the point that the drive
> TM> will never spin up again.
>
> Interesting!  Have you actually had this happen?  I've had drives fail
> on restart but not because they wouldn't spin up (as far as I know).

yup.. but only on old scsi drives

> I've had drives fail very quickly when I've packed too many of them into
> a single case (as in weeks or months).  We needed the additional space
> and we were lucky to get the drives--asking for more fans or a better
> case or anything like that would have been an exercise in futility.

jeez how much does a fan cost?



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