Date: Mon, 20 Oct 2014 21:26:18 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Alex <alex@putnichek.ru>, freebsd-fs@FreeBSD.org Subject: Re: l2_io_error and l2_cksum_bad are not null and growing Message-ID: <544553CA.1060406@FreeBSD.org> In-Reply-To: <54454739.1070900@putnichek.ru> References: <54454739.1070900@putnichek.ru>
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On 20/10/2014 20:32, Alex wrote: > Hello. > > We seem to have a problem with l2arc on zfs system on 10.1-BETA1 FreeBSD > 10.1-BETA1 #1 r271710 server. The server has a l2arc cache configured from Intel > SSD 480G disk. The problem is that l2_io_error and l2_cksum_bad values are > constantly growing, however there are no traces of any hardware malfunctioning. > As for now, the values are > kstat.zfs.misc.arcstats.l2_io_error: 1501 > kstat.zfs.misc.arcstats.l2_cksum_bad: 19480 Please see if the following patch might help https://github.com/avg-I/freebsd/compare/review/l2arc-write-target-size.diff > Here is the output of zpool status: > pool: zpool > state: ONLINE > scan: none requested > config: > > NAME STATE READ WRITE CKSUM > zpool ONLINE 0 0 0 > mirror-0 ONLINE 0 0 0 > diskid/DISK-WD-WMC1P0DFSF47p2 ONLINE 0 0 0 > diskid/DISK-WD-WMC1P0DEFERYp2 ONLINE 0 0 0 > logs > gpt/zil0 ONLINE 0 0 0 > cache > gpt/cache0 ONLINE 0 0 0 > > errors: No known data errors > > Here is the output of zfs-stats -L: > ------------------------------------------------------------------------ > ZFS Subsystem Report Mon Oct 20 19:29:38 2014 > ------------------------------------------------------------------------ > > L2 ARC Summary: (DEGRADED) > Passed Headroom: 72.42m > Tried Lock Failures: 360.55m > IO In Progress: 65 > Low Memory Aborts: 101 > Free on Write: 7.09k > Writes While Full: 16.90k > R/W Clashes: 11 > Bad Checksums: 19.48k > IO Errors: 1.50k > SPA Mismatch: 1.18m > > L2 ARC Size: (Adaptive) 555.88 GiB > Header Size: 0.21% 1.17 GiB > > L2 ARC Evicts: > Lock Retries: 10 > Upon Reading: 0 > > L2 ARC Breakdown: 272.76m > Hit Ratio: 0.35% 949.30k > Miss Ratio: 99.65% 271.81m > Feeds: 2.19m > > L2 ARC Buffer: > Bytes Scanned: 20.45 PiB > Buffer Iterations: 2.19m > List Iterations: 139.97m > NULL List Iterations: 5.58k > > L2 ARC Writes: > Writes Sent: 100.00% 567.37k > > Any help is welcome. Best regards > -- Andriy Gapon
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