Date: Fri, 19 Feb 2016 12:58:29 +0100 From: Michelle Sullivan <michelle@sorbs.net> To: =?ISO-8859-1?Q?Niccol=F2_Corvini?= <n.corvini@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: Zfs heavy io writing | zfskern txg_thread_enter Message-ID: <56C70365.1050800@sorbs.net> In-Reply-To: <CAM1TVW-yOvU6VM19PadD5ygsv2-Vb-_8T7SKjcsP7Ov0Q5A5SQ@mail.gmail.com> References: <CAM1TVW-yOvU6VM19PadD5ygsv2-Vb-_8T7SKjcsP7Ov0Q5A5SQ@mail.gmail.com>
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Niccolò Corvini wrote:
> Hi, first time here!
> We are having a problem with a server running FreeBsd 9.1 with ZFS on a
>
You should upgrade to a supported version first... 9.3 would probably
be the best (rather than 10.x) as it's still supported and uses the same
ABI (ie you should need to reinstall all your ports/packages - though
you should because it sometimes breaks things - at least check for
broken things :) .)
If you're not familiar "freebsd-update -r 9.3-RELEASE upgrade" will help
you do it without too many problems.
> single sata drive. Since a few days ago, in the morning the system becomes
> really slow due of a really heavy io writing. We investigated and we think
> it might start at night, maybe correlated to to crondaily (standard) but we
> are not sure. After a few hours the situation returns to normal.
>
Yeah this sounds like something I am quite familiar with... It's the
security check cronjob that runs every day... its looking for any
setuid/setgid files, new/modified files...etc... across all file systems
> Any help is much appreciated
> The machine is a Intel Xeon E5-2620 with 36GB of RAM, the HDD is a 2TB an
> is half full.
> gstat output:
>
>
> PID JID USERNAME VCSW IVCSW READ WRITE FAULT TOTAL PERCENT COMMAND
> 3 0 root 14 1 0 37 0 37 30.33%
> [zfskern{txg_thread_enter}]
> 49866 215 7070 26 2 0 5 0 5 4.10%
>
>
> 93400 0 root 13 0 10 0 0 10 8.20% [find]
>
>
> 98335 120 root 11 0 29 0 0 29 23.77% find
> /var/log -name messages.* -mtime -2
> 16128 214 70 8 0 0 1 0 1 0.82%
> sendmail: ./u1J9k90d001112 local: client DATA status (send
> 1120 198 root 7 0 0 4 0 4 3.28%
> mail.local -l
>
>
You'll find it kicked off from /etc/periodic/daily/ with a config option
you can find in /etc/defaults/periodic.conf (or /etc/periodic.conf or
/etc/periodic.conf.local )...
Regards,
--
Michelle Sullivan
http://www.mhix.org/
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