Date: Tue, 08 Dec 2015 19:04:30 -0500 From: "Michael B. Eichorn" <ike@michaeleichorn.com> To: Dustin Wenz <dustinwenz@ebureau.com>, freebsd-stable@freebsd.org Subject: Re: Periodic jobs triggering panics in 10.1 and 10.2 Message-ID: <1449619470.31831.9.camel@michaeleichorn.com> In-Reply-To: <34FA7D40-8758-460D-AC14-20B21D2E3F8D@ebureau.com> References: <34FA7D40-8758-460D-AC14-20B21D2E3F8D@ebureau.com>
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On Tue, 2015-12-08 at 16:31 -0600, Dustin Wenz wrote: > I suspect this is a zfs bug that is triggered by the access patterns > in the periodic scripts. There is significant load on the system when > the scheduled processes start, because all jails execute the same > scripts at the same time. > > I've been able to alleviate this problem by disabling the security > scans within the jails, but leave it enabled on the root host. To avoid the problem of jails all starting things at the same time, use the cron(8) flags -j and -J to set a 'jitter' which will cause cron to sleep for a random period of specified duration (60 sec max). Cron flags can be set using the rc.conf variable 'cron_flags'.
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