Date: Fri, 18 Oct 2013 13:36:32 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Vitalij Satanivskij" <satan@ukr.net> Cc: satan@ukr.net, Dmitriy Makarov <supportme@ukr.net>, "Justin T. Gibbs" <gibbs@FreeBSD.org>, Borja Marcos <borjam@sarenet.es>, freebsd-current@freebsd.org Subject: Re: ZFS secondarycache on SSD problem on r255173 Message-ID: <256B2E5A0BA44DCBB45BB3F3E820E190@multiplay.co.uk> References: <4AA28730F331444AB13108ABF0CD68B7@multiplay.co.uk> <1379496242.750778745.m0ksff1m@fmst-6.ukr.net> <20131016080100.GA27758@hell.ukr.net> <3A44A8F6-8B62-4A23-819D-B91A3E6E5EF9@freebsd.org> <E5E6AB7C-C067-4B92-8A38-9DD811011D6F@FreeBSD.org> <7059AA6DCC0D46B8B1D33FC883C31643@multiplay.co.uk> <20131017061248.GA15980@hell.ukr.net> <326B470C65A04BC4BC83E118185B935F@multiplay.co.uk> <20131017073925.GA34958@hell.ukr.net> <2AFE1CBD9B124E3AB9E05A4E483CCE03@multiplay.co.uk> <20131018080148.GA75226@hell.ukr.net>
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Hmm so that rules out a TRIM related issue. I wonder if the
increase in ashift has triggered a problem in compression.
What are all the values reported by:
sysctl -a kstat.zfs.misc.arcstats
Regards
Steve
----- Original Message -----
From: "Vitalij Satanivskij" <satan@ukr.net>
To: "Steven Hartland" <killing@multiplay.co.uk>
Cc: <satan@ukr.net>; "Justin T. Gibbs" <gibbs@FreeBSD.org>; <freebsd-current@freebsd.org>; "Borja Marcos" <borjam@sarenet.es>;
"Dmitriy Makarov" <supportme@ukr.net>
Sent: Friday, October 18, 2013 9:01 AM
Subject: Re: ZFS secondarycache on SSD problem on r255173
> Hello.
>
> Yesterday system was rebooted with vfs.zfs.trim.enabled=0
>
> System version 10.0-BETA1 FreeBSD 10.0-BETA1 #6 r256669, without any changes in code
>
> Uptime 10:51 up 16:41
>
> sysctl vfs.zfs.trim.enabled
> vfs.zfs.trim.enabled: 0
>
> Around 2 hours ago errors counter's
> kstat.zfs.misc.arcstats.l2_cksum_bad: 854359
> kstat.zfs.misc.arcstats.l2_io_error: 38254
>
> begin grow from zero values.
>
> After remove cache
> 2013-10-18.10:37:10 zpool remove disk1 gpt/cache0 gpt/cache1 gpt/cache2
>
> and attach again
>
> 2013-10-18.10:38:28 zpool add disk1 cache gpt/cache0 gpt/cache1 gpt/cache2
>
> counters stop growing (of couse thay not zeroed)
>
> before cache remove kstat.zfs.misc.arcstats.l2_asize was around 280GB
>
> hw size of l2 cache is 3x164G
>
> => 34 351651821 ada3 GPT (168G)
> 34 6 - free - (3.0K)
> 40 8388608 1 zil2 (4.0G)
> 8388648 343263200 2 cache2 (164G)
> 351651848 7 - free - (3.5K)
>
>
> Any hypothesis what alse we can test/try etc?
>
>
>
> Steven Hartland wrote:
> SH> Correct.
> SH> ----- Original Message -----
> SH> From: "Vitalij Satanivskij" <satan@ukr.net>
> SH>
> SH>
> SH> > Just to be sure I understand you clearly, I need to test next configuration:
> SH> >
> SH> > 1) System with ashift patch eg. just latest stable/10 revision
> SH> > 2) vfs.zfs.trim.enabled=0 in /boot/loader.conf
> SH> >
> SH> > So realy only diferens in default system configuration is disabled trim functional ?
> SH> >
> SH> >
> SH> >
> SH> > Steven Hartland wrote:
> SH> > SH> Still worth testing with the problem version installed but
> SH> > SH> with trim disabled to see if that clears the issues, if
> SH> > SH> nothing else it will confirm / deny if trim is involved.
> SH>
> SH>
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