From owner-freebsd-questions@FreeBSD.ORG Sun Feb 6 13:01:45 2005 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0AA9A16A4CE for ; Sun, 6 Feb 2005 13:01:45 +0000 (GMT) Received: from smtp1.bahnhof.se (smtp1.bahnhof.se [213.80.101.11]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5A63643D41 for ; Sun, 6 Feb 2005 13:01:44 +0000 (GMT) (envelope-from mark.rowlands@mypost.se) Received: from mfilter2.bahnhof.se (mail.bahnhof.se [213.136.33.1]) by re-injector-s1.bahnhof.se (Postfix) with ESMTP id 210281FCF17; Sun, 6 Feb 2005 14:01:43 +0100 (CET) Received: from localhost (mfilter2.local [127.0.0.1]) by re-injector2.bahnhof.se (Postfix) with ESMTP id 0C0B5AA522; Sun, 6 Feb 2005 14:01:43 +0100 (CET) Received: from smtp5.bahnhof.se ([213.136.33.1]) by localhost (mfilter2.bahnhof.se [10.0.1.22]) (amavisd-new, port 10024) with ESMTP id 15837-07; Sun, 6 Feb 2005 14:01:42 +0100 (CET) Received: from pcmarpxy.mwrwin2k.se (81-170-150-191.bahnhofbredband.net [81.170.150.191]) by smtp5.bahnhof.se (Postfix) with ESMTP id 7910017349B; Sun, 6 Feb 2005 14:01:42 +0100 (CET) Received: from localhost (localhost.mwrwin2k.se [127.0.0.1]) by pcmarpxy.mwrwin2k.se (Postfix) with ESMTP id AD63AAC80E; Sun, 6 Feb 2005 14:01:28 +0100 (CET) Received: from pcmarpxy.mwrwin2k.se ([127.0.0.1]) by localhost (pcmarpxy.mwrwin2k.se [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 34818-04; Sun, 6 Feb 2005 14:01:25 +0100 (CET) Received: from localhost.mwrwin2k.se (localhost.mwrwin2k.se [127.0.0.1]) by pcmarpxy.mwrwin2k.se (Postfix) with ESMTP id 3D18EAC80B; Sun, 6 Feb 2005 14:01:25 +0100 (CET) From: Mark Rowlands To: freebsd-questions@freebsd.org Date: Sun, 6 Feb 2005 14:01:15 +0100 User-Agent: KMail/1.7.2 References: <200502051745.25937.hindrich@worldchat.com> <1088851878.20050206122453@wanadoo.fr> In-Reply-To: <1088851878.20050206122453@wanadoo.fr> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200502061401.20967.mark.rowlands@mypost.se> X-Virus-Scanned: amavisd-new at bahnhof.se cc: Anthony Atkielski Subject: Re: Leaving a Computer Running ? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: mark.rowlands@mypost.se List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 06 Feb 2005 13:01:45 -0000 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?