Date: Sat, 13 Jun 2009 15:54:07 -0500 From: "James R. Van Artsdalen" <james-freebsd-current@jrv.org> To: Pawel Jakub Dawidek <pjd@freebsd.org> Cc: freebsd-fs@freebsd.org, Kip Macy <kip.macy@gmail.com>, FreeBSD Current <freebsd-current@freebsd.org>, Thomas Backman <serenity@exscape.org> Subject: Re: ZFS: Silent/hidden errors, nothing logged anywhere Message-ID: <4A3411EF.5000307@jrv.org> In-Reply-To: <20090613150627.GB1848@garage.freebsd.pl> References: <920A69B1-4F06-477E-A13B-63CC22A13120@exscape.org> <3c1674c90906121401s19105167vf4535566321b45de@mail.gmail.com> <20090613150627.GB1848@garage.freebsd.pl>
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Pawel Jakub Dawidek wrote:
>
> We do log such errors. Solaris uses FMA and for FreeBSD I use devd. You
> can find the following entry in /etc/devd.conf:
>
> notify 10 {
> match "system" "ZFS";
> match "type" "checksum";
> action "logger -p kern.warn 'ZFS: checksum mismatch, zpool=$pool path=$vdev_path offset=$zio_offset size=$zio_size'";
> };
>
> If you see nothing in your logs, there must be a bug with reporting the
> problem somewhere or devd is not running (it should be enabled by
> default).
>
Looking at vsyslog(3), I don't think logger(1) can ever log with
facility KERN. LOG_KERN is 0, so this in vsyslog
/* Set default facility if none specified. */
if ((pri & LOG_FACMASK) == 0)
pri |= LogFacility;
will always change the KERN facility is to LogFacility, which defaults
to LOG_USER.
So the devd output is really going to user.warn and a syslog.conf line like
kern.* /var/log/kernel.log
will capture kernel messages, but not the devd logger output, and if you
look in kernel.log you won't find the checksum errors.
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