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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