Am 09.03.2010 um 11:53 schrieb Peter Jeremy: > On 2010-Mar-09 10:15:53 +0100, Stefan Bethke <s...@lassitu.de> wrote: >> Over the past couple of months, I've more or less regularly observed >> machines having more and more processes stuck in the zfs wchan. The >> processes never recover from that, > > How long have you waited?
Many hours, sometimes up to 48 hours (when I didn't notice the stuck processes at first). > There seems to be a problem with low free memory handling that causes ZFS > to turn into cold molasses. The work-around is to run a program that > allocates a decent size chunk of memory and then exits. The original > suggestion was something like: > perl -e '@x = (0) x 1000000;' > I've written a short program that allocates and dirties ~100MB and then > exits and run it from cron. I'll try that the next time I encounter the stuck processes. I'm recording ZFS ARC stats with munin, would I be able to identify such a low memory situation from there? Would it make sense to monitor other stats? Thanks, Stefan -- Stefan Bethke <s...@lassitu.de> Fon +49 151 14070811 _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
