From owner-freebsd-fs@FreeBSD.ORG Mon Mar 30 21:54:10 2015 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 9E801797 for ; Mon, 30 Mar 2015 21:54:10 +0000 (UTC) Received: from fs.denninger.net (wsip-70-169-168-7.pn.at.cox.net [70.169.168.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "NewFS.denninger.net", Issuer "NewFS.denninger.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 33315D92 for ; Mon, 30 Mar 2015 21:54:09 +0000 (UTC) Received: from [192.168.1.6] (localhost [127.0.0.1]) by fs.denninger.net (8.14.9/8.14.8) with ESMTP id t2ULg7Po062164 for ; Mon, 30 Mar 2015 16:42:09 -0500 (CDT) (envelope-from karl@denninger.net) Received: from [192.168.1.6] (TLS/SSL) [173.65.72.120] by Spamblock-sys (LOCAL/AUTH); Mon Mar 30 16:42:09 2015 Message-ID: <5519C329.3090001@denninger.net> Date: Mon, 30 Mar 2015 16:42:01 -0500 From: Karl Denninger User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: freebsd-fs@freebsd.org Subject: Re: All available memory used when deleting files from ZFS References: In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms050403070308090107060506" X-Content-Filtered-By: Mailman/MimeDel 2.1.18-1 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Mar 2015 21:54:10 -0000 This is a cryptographically signed message in MIME format. --------------ms050403070308090107060506 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable What's the UMA memory use look like on that machine when the remove is initiated and progresses? Look with vmstat -z and see what the used and free counts look like for the zio allocations...... On 3/30/2015 4:14 PM, Dustin Wenz wrote: > I had several systems panic or hang over the weekend while deleting som= e data off of their local zfs filesystem. It looks like they ran out of p= hysical memory (32GB), and hung when paging to swap-on-zfs (which is not = surprising, given that ZFS was likely using the memory). They were runnin= g 10.1-STABLE r277139M, which I built in the middle of January. The pools= were about 35TB in size, and are a concatenation of 3TB mirrors. They we= re maybe 95% full. I deleted just over 1000 files, totaling 25TB on each = system. > > It took roughly 10 minutes to remove that 25TB of data per host using a= remote rsync, and immediately after that everything seemed fine. However= , after several more minutes, every machine that had data removed became = unresponsive. Some had numerous "swap_pager: indefinite wait buffer" erro= rs followed by a panic, and some just died with no console messages. The = same thing would happen after a reboot, when FreeBSD attempted to mount t= he local filesystem again. > > I was able to boot these systems after exporting the affected pool, but= the problem would recur several minutes after initiating a "zpool import= ". Watching zfs statistics didn't seem to reveal where the memory was goi= ng; ARC would only climb to about 4GB, but free memory would decline rapi= dly. Eventually, after enough export/reboot/import cycles, the pool would= import successfully and everything would be fine from then on. Note that= there is no L2ARC or compression being used. > > Has anyone else run into this when deleting files on ZFS? It seems to b= e a consistent problem under the versions of 10.1 I'm running. > > For reference, I've appended a zstat dump below that was taken 5 minute= s after starting a zpool import, and was about three minutes before the m= achine became unresponsive. You can see that the ARC is only 4GB, but fre= e memory was down to 471MB (and continued to drop). > > - .Dustin > > > -----------------------------------------------------------------------= - > ZFS Subsystem Report Mon Mar 30 12:35:27 2015 > -----------------------------------------------------------------------= - > > System Information: > > Kernel Version: 1001506 (osreldate) > Hardware Platform: amd64 > Processor Architecture: amd64 > > ZFS Storage pool Version: 5000 > ZFS Filesystem Version: 5 > > FreeBSD 10.1-STABLE #11 r277139M: Tue Jan 13 14:59:55 CST 2015 root > 12:35PM up 8 mins, 3 users, load averages: 7.23, 8.96, 4.87 > > -----------------------------------------------------------------------= - > > System Memory: > > 0.17% 55.40 MiB Active, 0.14% 46.11 MiB Inact > 98.34% 30.56 GiB Wired, 0.00% 0 Cache > 1.34% 425.46 MiB Free, 0.00% 4.00 KiB Gap > > Real Installed: 32.00 GiB > Real Available: 99.82% 31.94 GiB > Real Managed: 97.29% 31.08 GiB > > Logical Total: 32.00 GiB > Logical Used: 98.56% 31.54 GiB > Logical Free: 1.44% 471.57 MiB > > Kernel Memory: 3.17 GiB > Data: 99.18% 3.14 GiB > Text: 0.82% 26.68 MiB > > Kernel Memory Map: 31.08 GiB > Size: 14.18% 4.41 GiB > Free: 85.82% 26.67 GiB > > -----------------------------------------------------------------------= - > > ARC Summary: (HEALTHY) > Memory Throttle Count: 0 > > ARC Misc: > Deleted: 145 > Recycle Misses: 0 > Mutex Misses: 0 > Evict Skips: 0 > > ARC Size: 14.17% 4.26 GiB > Target Size: (Adaptive) 100.00% 30.08 GiB > Min Size (Hard Limit): 12.50% 3.76 GiB > Max Size (High Water): 8:1 30.08 GiB > > ARC Size Breakdown: > Recently Used Cache Size: 50.00% 15.04 GiB > Frequently Used Cache Size: 50.00% 15.04 GiB > > ARC Hash Breakdown: > Elements Max: 270.56k > Elements Current: 100.00% 270.56k > Collisions: 23.66k > Chain Max: 3 > Chains: 8.28k > > -----------------------------------------------------------------------= - > > ARC Efficiency: 2.93m > Cache Hit Ratio: 70.44% 2.06m > Cache Miss Ratio: 29.56% 866.05k > Actual Hit Ratio: 70.40% 2.06m > > Data Demand Efficiency: 97.47% 24.58k > Data Prefetch Efficiency: 1.88% 479 > > CACHE HITS BY CACHE LIST: > Anonymously Used: 0.05% 1.07k > Most Recently Used: 71.82% 1.48m > Most Frequently Used: 28.13% 580.49k > Most Recently Used Ghost: 0.00% 0 > Most Frequently Used Ghost: 0.00% 0 > > CACHE HITS BY DATA TYPE: > Demand Data: 1.16% 23.96k > Prefetch Data: 0.00% 9 > Demand Metadata: 98.79% 2.04m > Prefetch Metadata: 0.05% 1.08k > > CACHE MISSES BY DATA TYPE: > Demand Data: 0.07% 621 > Prefetch Data: 0.05% 470 > Demand Metadata: 99.69% 863.35k > Prefetch Metadata: 0.19% 1.61k > > -----------------------------------------------------------------------= - > > L2ARC is disabled > > -----------------------------------------------------------------------= - > > File-Level Prefetch: (HEALTHY) > > DMU Efficiency: 72.95k > Hit Ratio: 70.83% 51.66k > Miss Ratio: 29.17% 21.28k > > Colinear: 21.28k > Hit Ratio: 0.01% 2 > Miss Ratio: 99.99% 21.28k > > Stride: 50.45k > Hit Ratio: 99.98% 50.44k > Miss Ratio: 0.02% 9 > > DMU Misc: > Reclaim: 21.28k > Successes: 1.73% 368 > Failures: 98.27% 20.91k > > Streams: 1.23k > +Resets: 0.16% 2 > -Resets: 99.84% 1.23k > Bogus: 0 > > -----------------------------------------------------------------------= - > > VDEV cache is disabled > > -----------------------------------------------------------------------= - > > ZFS Tunables (sysctl): > kern.maxusers 2380 > vm.kmem_size 33367830528 > vm.kmem_size_scale 1 > vm.kmem_size_min 0 > vm.kmem_size_max 1319413950874 > vfs.zfs.arc_max 32294088704 > vfs.zfs.arc_min 4036761088 > vfs.zfs.arc_average_blocksize 8192 > vfs.zfs.arc_shrink_shift 5 > vfs.zfs.arc_free_target 56518 > vfs.zfs.arc_meta_used 4534349216 > vfs.zfs.arc_meta_limit 8073522176 > vfs.zfs.l2arc_write_max 8388608 > vfs.zfs.l2arc_write_boost 8388608 > vfs.zfs.l2arc_headroom 2 > vfs.zfs.l2arc_feed_secs 1 > vfs.zfs.l2arc_feed_min_ms 200 > vfs.zfs.l2arc_noprefetch 1 > vfs.zfs.l2arc_feed_again 1 > vfs.zfs.l2arc_norw 1 > vfs.zfs.anon_size 1786368 > vfs.zfs.anon_metadata_lsize 0 > vfs.zfs.anon_data_lsize 0 > vfs.zfs.mru_size 504812032 > vfs.zfs.mru_metadata_lsize 415273472 > vfs.zfs.mru_data_lsize 35227648 > vfs.zfs.mru_ghost_size 0 > vfs.zfs.mru_ghost_metadata_lsize 0 > vfs.zfs.mru_ghost_data_lsize 0 > vfs.zfs.mfu_size 3925990912 > vfs.zfs.mfu_metadata_lsize 3901947392 > vfs.zfs.mfu_data_lsize 7000064 > vfs.zfs.mfu_ghost_size 0 > vfs.zfs.mfu_ghost_metadata_lsize 0 > vfs.zfs.mfu_ghost_data_lsize 0 > vfs.zfs.l2c_only_size 0 > vfs.zfs.dedup.prefetch 1 > vfs.zfs.nopwrite_enabled 1 > vfs.zfs.mdcomp_disable 0 > vfs.zfs.max_recordsize 1048576 > vfs.zfs.dirty_data_max 3429735628 > vfs.zfs.dirty_data_max_max 4294967296 > vfs.zfs.dirty_data_max_percent 10 > vfs.zfs.dirty_data_sync 67108864 > vfs.zfs.delay_min_dirty_percent 60 > vfs.zfs.delay_scale 500000 > vfs.zfs.prefetch_disable 0 > vfs.zfs.zfetch.max_streams 8 > vfs.zfs.zfetch.min_sec_reap 2 > vfs.zfs.zfetch.block_cap 256 > vfs.zfs.zfetch.array_rd_sz 1048576 > vfs.zfs.top_maxinflight 32 > vfs.zfs.resilver_delay 2 > vfs.zfs.scrub_delay 4 > vfs.zfs.scan_idle 50 > vfs.zfs.scan_min_time_ms 1000 > vfs.zfs.free_min_time_ms 1000 > vfs.zfs.resilver_min_time_ms 3000 > vfs.zfs.no_scrub_io 0 > vfs.zfs.no_scrub_prefetch 0 > vfs.zfs.free_max_blocks -1 > vfs.zfs.metaslab.gang_bang 16777217 > vfs.zfs.metaslab.fragmentation_threshold70 > vfs.zfs.metaslab.debug_load 0 > vfs.zfs.metaslab.debug_unload 0 > vfs.zfs.metaslab.df_alloc_threshold 131072 > vfs.zfs.metaslab.df_free_pct 4 > vfs.zfs.metaslab.min_alloc_size 33554432 > vfs.zfs.metaslab.load_pct 50 > vfs.zfs.metaslab.unload_delay 8 > vfs.zfs.metaslab.preload_limit 3 > vfs.zfs.metaslab.preload_enabled 1 > vfs.zfs.metaslab.fragmentation_factor_enabled1 > vfs.zfs.metaslab.lba_weighting_enabled 1 > vfs.zfs.metaslab.bias_enabled 1 > vfs.zfs.condense_pct 200 > vfs.zfs.mg_noalloc_threshold 0 > vfs.zfs.mg_fragmentation_threshold 85 > vfs.zfs.check_hostid 1 > vfs.zfs.spa_load_verify_maxinflight 10000 > vfs.zfs.spa_load_verify_metadata 1 > vfs.zfs.spa_load_verify_data 1 > vfs.zfs.recover 0 > vfs.zfs.deadman_synctime_ms 1000000 > vfs.zfs.deadman_checktime_ms 5000 > vfs.zfs.deadman_enabled 1 > vfs.zfs.spa_asize_inflation 24 > vfs.zfs.spa_slop_shift 5 > vfs.zfs.space_map_blksz 4096 > vfs.zfs.txg.timeout 5 > vfs.zfs.vdev.metaslabs_per_vdev 200 > vfs.zfs.vdev.cache.max 16384 > vfs.zfs.vdev.cache.size 0 > vfs.zfs.vdev.cache.bshift 16 > vfs.zfs.vdev.trim_on_init 1 > vfs.zfs.vdev.mirror.rotating_inc 0 > vfs.zfs.vdev.mirror.rotating_seek_inc 5 > vfs.zfs.vdev.mirror.rotating_seek_offset1048576 > vfs.zfs.vdev.mirror.non_rotating_inc 0 > vfs.zfs.vdev.mirror.non_rotating_seek_inc1 > vfs.zfs.vdev.async_write_active_min_dirty_percent30 > vfs.zfs.vdev.async_write_active_max_dirty_percent60 > vfs.zfs.vdev.max_active 1000 > vfs.zfs.vdev.sync_read_min_active 10 > vfs.zfs.vdev.sync_read_max_active 10 > vfs.zfs.vdev.sync_write_min_active 10 > vfs.zfs.vdev.sync_write_max_active 10 > vfs.zfs.vdev.async_read_min_active 1 > vfs.zfs.vdev.async_read_max_active 3 > vfs.zfs.vdev.async_write_min_active 1 > vfs.zfs.vdev.async_write_max_active 10 > vfs.zfs.vdev.scrub_min_active 1 > vfs.zfs.vdev.scrub_max_active 2 > vfs.zfs.vdev.trim_min_active 1 > vfs.zfs.vdev.trim_max_active 64 > vfs.zfs.vdev.aggregation_limit 131072 > vfs.zfs.vdev.read_gap_limit 32768 > vfs.zfs.vdev.write_gap_limit 4096 > vfs.zfs.vdev.bio_flush_disable 0 > vfs.zfs.vdev.bio_delete_disable 0 > vfs.zfs.vdev.trim_max_bytes 2147483648 > vfs.zfs.vdev.trim_max_pending 64 > vfs.zfs.max_auto_ashift 13 > vfs.zfs.min_auto_ashift 9 > vfs.zfs.zil_replay_disable 0 > vfs.zfs.cache_flush_disable 0 > vfs.zfs.zio.use_uma 1 > vfs.zfs.zio.exclude_metadata 0 > vfs.zfs.sync_pass_deferred_free 2 > vfs.zfs.sync_pass_dont_compress 5 > vfs.zfs.sync_pass_rewrite 2 > vfs.zfs.snapshot_list_prefetch 0 > vfs.zfs.super_owner 0 > vfs.zfs.debug 0 > vfs.zfs.version.ioctl 4 > vfs.zfs.version.acl 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