Date: Sat, 19 Jan 2013 12:19:14 -0800 From: John <john@theusgroup.com> To: Marin Atanasov Nikolov <dnaeon@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: Spontaneous reboots on Intel i5 and FreeBSD 9.0 Message-ID: <20130119201914.84B761CB@server.theusgroup.com> In-Reply-To: <CAJ-UWtRRfCKg9GBR_ppvtjvJGadiOXMXBFBpX7tAvLEXDoZHQg@mail.gmail.com> References: <CAJ-UWtSANRMsOqwW9rJ6Eebta6=AiHeNO6fhPO0mhYhZiMmn4A@mail.gmail.com> <op.wq3zxn038527sy@ronaldradial.versatec.local> <alpine.BSF.2.00.1301180758460.96418@wonkity.com> <1358527685.32417.237.camel@revolution.hippie.lan> <20130118173602.GA76438@neutralgood.org> <alpine.BSF.2.00.1301181313560.1604@wonkity.com> <CAJ-UWtRRfCKg9GBR_ppvtjvJGadiOXMXBFBpX7tAvLEXDoZHQg@mail.gmail.com>
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>At 03:00am I can see that periodic(8) runs, but I don't see what could have >taken so much of the free memory. I'm also running this system on ZFS and >have daily rotating ZFS snapshots created - currently the number of ZFS >snapshots are > 1000, and not sure if that could be causing this. Here's a >list of the periodic(8) daily scripts that run at 03:00am time. > >% ls -1 /etc/periodic/daily >800.scrub-zfs > >% ls -1 /usr/local/etc/periodic/daily >402.zfSnap >403.zfSnap_delete On a couple of my zfs machines, I've found running a scrub along with other high file system users to be a problem. I therefore run scrub from cron and schedule it so it doesn't overlap with periodic. I also found on a machine with an i3 and 4G ram that overlapping scrubs and snapshot destroy would cause the machine to grind to the point of being non-responsive. This was not a problem when the machine was new, but became one as the pool got larger (dedup is off and the pool is at 45% capacity). I use my own zfs management script and it prevents snapshot destroys from overlapping scrubs, and with a lockfile it prevents a new destroy from being initiated when an old one is still running. zfSnap has its -S switch to prevent actions during a scrub which you should use if you haven't already. Since making these changes, a machine that would have to be rebooted several times a week has now been up 61 days. John Theus TheUs Group
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