Date: Tue, 21 Oct 2014 15:51:16 +0400 From: Alex <alex@putnichek.ru> To: Andriy Gapon <avg@FreeBSD.org>, freebsd-fs@FreeBSD.org Subject: Re: l2_io_error and l2_cksum_bad are not null and growing Message-ID: <544648B4.9030106@putnichek.ru> In-Reply-To: <544553CA.1060406@FreeBSD.org> References: <54454739.1070900@putnichek.ru> <544553CA.1060406@FreeBSD.org>
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Hello. As I see this patch seems to be pretty old. How can it be that it haven't been included in the stable branche since then? The problem is that I can't afford making experiments on the production server. Is there any official solution of the issue? Alex 10/20/14 10:26 PM, Andriy Gapon пишет: > 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 >> >
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