On 08/03/2013 08:07, Гуляев Гоша wrote: > 05.03.2013, 23:14, "Ivan Voras" <ivo...@freebsd.org>: > > On 27/02/2013 05:39, Гуляев Гоша wrote: > > And when I have some intensive I/O tasks (csup -g /root/mysupfile, > or > portsnap fetch update, or rm -rf /usr/obj, when system working > sequentialy with many files in general) my system begins > periodically > freezes. If I see gstat it shows me 100% I\O on disk. > > It usually means some kind of incompatibility of your disk drive and > the > system, its controller or its driver. > Sometimes it could me that the disk is broken. > > Ivan, thank for answer! I think there is no any hardware problem, > because as I say before, in other OS'es all works fine, without > performance problems. How I can diagnose problem deeply, and maybe give > some useful information for resolving that issue?
It is hard to give good general advice in this case. You could maybe see if there are any error messages in your /var/log/messages file. You could also monitor the wchan of the hung process and verify if it's stuck in the "wdrain" state (in "top"). Maybe you could see if there is a problem with interrupts on the machine (either by using "systat -vm" or "vmstat -i"). You could run "iostat -x" and see if the %busy column is 100% while there are many queued requests. If you install smartmontools, you can run a couple of tests just in case (try smartctl /dev/ada0 and smartctl -t long /dev/ada0). ... but if the problem is an incompatibility with the driver, all this will probably not help you much.
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