Date: Wed, 3 Feb 2010 12:53:58 -0600 (CST) From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: Attila Nagy <bra@fsn.hu> Cc: freebsd-fs@freebsd.org Subject: Re: Machine stops for some seconds with ZFS Message-ID: <alpine.GSO.2.01.1002031241270.17824@freddy.simplesystems.org> In-Reply-To: <4B69BD8E.5020501@fsn.hu> References: <4B694689.2030704@fsn.hu> <alpine.GSO.2.01.1002030935150.17824@freddy.simplesystems.org> <4B69BD8E.5020501@fsn.hu>
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On Wed, 3 Feb 2010, Attila Nagy wrote: > - I've switched back to ZFS recently, and noticing the stuff, I've written, Ok. > - during building a world from ZFS, I've noticed that the machine > occasionally goes very silent. Building world means CPU usage, CPU usage > means higher temperatures, higher temperatures mean fans spinning faster, and > fans spinning faster make a lot of noise. So the loudness is normal when it > builds world. The silency is also normal when it does not. But it's not > normal when during a buildworld the whole machine stops for about 10-30 > seconds (stopping means the CPU is so much idle, that the machine can > completely stop the fans, which during normal operation does not occur). Your previous description made it sound like the fan speed changes were quite abrupt and dramatic. If this was so, then it could indicate a software or hardware problem related to power management. For example, some needed hardware might be temporarily shut down. My wife's Apple G5 abruptly roars its fans due to a few mouse movements but I can run intense benchmarks on it for hours via a network login and the fan speed does not increase (and it does not melt) so it seems obvious that fan designs can be stupid. > Yes, of course this is ZFS on FreeBSD, I could write that into the subject, > but if this wasn't on FreeBSD, I would wrote to the OpenSolaris list... My point is that you are assuming that the issue is with ZFS since 12-days after switching to it, you encountered a problem. The problem may very well be something else such as a hardware problem, a device driver problem, or something related to power management. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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