Date: Tue, 24 Aug 2010 00:43:51 +0100 From: Tim Bishop <tim@bishnet.net> To: Peter Jeremy <peterjeremy@acm.org> Cc: freebsd-stable@FreeBSD.org Subject: Re: 8.1R ZFS almost locking up system Message-ID: <20100823234351.GC5352@carrick-users.bishnet.net> In-Reply-To: <20100823204923.GA7142@server.vk2pj.dyndns.org> References: <20100821220435.GA6208@carrick-users.bishnet.net> <20100823204923.GA7142@server.vk2pj.dyndns.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, Aug 24, 2010 at 06:49:23AM +1000, Peter Jeremy wrote: > On 2010-Aug-21 23:04:35 +0100, Tim Bishop <tim@bishnet.net> wrote: > >I've had a problem on a FreeBSD 8.1R system for a few weeks. It seems > >that ZFS gets in to an almost unresponsive state. Last time it did it > >(two weeks ago) I couldn't even log in, although the system was up, this > >time I could manage a reboot but couldn't stop any applications (they > >were likely hanging on I/O). > > Unless you have a ZFS-only system, it's possible you are running out > of free memory (see the "free" entry in top(1) or 'systat -v') - in > which case r211581 (and r211599 which fixes a mismerge) should help. > Your very high kstat.zfs.misc.arcstats.memory_throttle_count suggests > this is your problem. Thanks. At the time I had a reasonable amount free (~450MB from 3GB), but it had dropped lower than that at some points previously. I'll take a closer look at that next time, and look at that patch (or upgrade to 8-STABLE). And the system has a UFS root, but all the apps/data are stored in ZFS. Tim. -- Tim Bishop http://www.bishnet.net/tim/ PGP Key: 0x5AE7D984
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20100823234351.GC5352>