Date: Sat, 09 Jul 2011 21:52:55 +0530 From: Manish Jain <invalid.pointer@gmail.com> To: Chuck Swiger <cswiger@mac.com> Cc: freebsd-questions@freebsd.org Subject: Re: disk spinning continuously + cpu possibly overheating = sudden death Message-ID: <4E18805F.2000401@gmail.com> In-Reply-To: <0C3600E5-1324-4852-894A-D29F3445660C@mac.com> References: <20110709053404.B1FC910656AE@hub.freebsd.org> <4E18332F.1040805@gmail.com> <0C3600E5-1324-4852-894A-D29F3445660C@mac.com>
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Hi Chuck, What do I make of it when the system runs flawlessly both on Win XP and FreeBSD-8.0-amd64 ? BTW, 8.2 does NOT - for reasons unfathomable to me - install /usr/sbin/apmd. I don't know how significant that is, but I have had to insert into rc.conf : apm_enable="NO" apmd_enable="NO" Thanks for any help. Regards Manish Jain [1]invalid.pointer@gmail.com On 09-Jul-11 19:59, Chuck Swiger wrote: On Jul 9, 2011, at 3:53 AM, Manish Jain wrote: I am running FreeBSD-8.2-amd64 on a Western Digital 320 GD disk and a quad-core AMD Phenom processor. After booting, the disk keeps continuously (meaning continuous I/O) and after a couple of hours (on the console with the X server not running), suddenly the whole system dies, powering off in a flash. I suspect the continuous I/O is causing is a CPU overheat which results in this behaviour. While you probably do have flaky hardware causing problems, even under the wors t case situation, a modern hard drive doesn't use more than about 10W even unde r full load (ie, continuous writes). Compare that with the 125W thermal design rating of a 4-core Phenom. If your system is overheating, it's not because of what a hard drive is doing. It should be easy to tell if thermals are an issue-- is the CPU heat sink getti ng too hot to touch just before this shutdown? If so, it's likely to be a prob lem with a cooling fan or heatsink attachment. Also, what is it that makes you think your disk is doing continuous I/O? What does "iostat 5" or similar show? Regards, References 1. mailto:invalid.pointer@gmail.com
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