Date: Sun, 19 Jul 2020 10:17:02 -0400 From: mike tancsa <mike@sentex.net> To: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: zfs meta data slowness Message-ID: <b6d670e6-6e35-a1f7-7daf-76b458f26e30@sentex.net>
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Are there any tweaks that can be done to speed up or improve zfs metadata performance ? I have a backup server with a lot of snapshots (40,000) and just doing a listing can take a great deal of time. Best case scenario is about 24 seconds, worst case, I have seen it up to 15 minutes. (FreeBSD 12.1-STABLE r363078) ARC Efficiency: 79.33b Cache Hit Ratio: 92.81% 73.62b Cache Miss Ratio: 7.19% 5.71b Actual Hit Ratio: 92.78% 73.60b Data Demand Efficiency: 96.47% 461.91m Data Prefetch Efficiency: 1.00% 262.73m CACHE HITS BY CACHE LIST: Anonymously Used: 0.01% 3.86m Most Recently Used: 3.91% 2.88b Most Frequently Used: 96.06% 70.72b Most Recently Used Ghost: 0.01% 5.31m Most Frequently Used Ghost: 0.01% 10.47m CACHE HITS BY DATA TYPE: Demand Data: 0.61% 445.60m Prefetch Data: 0.00% 2.63m Demand Metadata: 99.36% 73.15b Prefetch Metadata: 0.03% 21.00m CACHE MISSES BY DATA TYPE: Demand Data: 0.29% 16.31m Prefetch Data: 4.56% 260.10m Demand Metadata: 95.02% 5.42b Prefetch Metadata: 0.14% 7.75m Other than increase the metadata max, I havent really changed any tuneables ZFS Tunables (sysctl): kern.maxusers 4416 vm.kmem_size 66691842048 vm.kmem_size_scale 1 vm.kmem_size_min 0 vm.kmem_size_max 1319413950874 vfs.zfs.trim.max_interval 1 vfs.zfs.trim.timeout 30 vfs.zfs.trim.txg_delay 32 vfs.zfs.trim.enabled 1 vfs.zfs.vol.immediate_write_sz 32768 vfs.zfs.vol.unmap_sync_enabled 0 vfs.zfs.vol.unmap_enabled 1 vfs.zfs.vol.recursive 0 vfs.zfs.vol.mode 1 vfs.zfs.version.zpl 5 vfs.zfs.version.spa 5000 vfs.zfs.version.acl 1 vfs.zfs.version.ioctl 7 vfs.zfs.debug 0 vfs.zfs.super_owner 0 vfs.zfs.immediate_write_sz 32768 vfs.zfs.sync_pass_rewrite 2 vfs.zfs.sync_pass_dont_compress 5 vfs.zfs.sync_pass_deferred_free 2 vfs.zfs.zio.dva_throttle_enabled 1 vfs.zfs.zio.exclude_metadata 0 vfs.zfs.zio.use_uma 1 vfs.zfs.zio.taskq_batch_pct 75 vfs.zfs.zil_maxblocksize 131072 vfs.zfs.zil_slog_bulk 786432 vfs.zfs.zil_nocacheflush 0 vfs.zfs.zil_replay_disable 0 vfs.zfs.cache_flush_disable 0 vfs.zfs.standard_sm_blksz 131072 vfs.zfs.dtl_sm_blksz 4096 vfs.zfs.min_auto_ashift 9 vfs.zfs.max_auto_ashift 13 vfs.zfs.vdev.trim_max_pending 10000 vfs.zfs.vdev.bio_delete_disable 0 vfs.zfs.vdev.bio_flush_disable 0 vfs.zfs.vdev.def_queue_depth 32 vfs.zfs.vdev.queue_depth_pct 1000 vfs.zfs.vdev.write_gap_limit 4096 vfs.zfs.vdev.read_gap_limit 32768 vfs.zfs.vdev.aggregation_limit_non_rotating131072 vfs.zfs.vdev.aggregation_limit 1048576 vfs.zfs.vdev.initializing_max_active 1 vfs.zfs.vdev.initializing_min_active 1 vfs.zfs.vdev.removal_max_active 2 vfs.zfs.vdev.removal_min_active 1 vfs.zfs.vdev.trim_max_active 64 vfs.zfs.vdev.trim_min_active 1 vfs.zfs.vdev.scrub_max_active 2 vfs.zfs.vdev.scrub_min_active 1 vfs.zfs.vdev.async_write_max_active 10 vfs.zfs.vdev.async_write_min_active 1 vfs.zfs.vdev.async_read_max_active 3 vfs.zfs.vdev.async_read_min_active 1 vfs.zfs.vdev.sync_write_max_active 10 vfs.zfs.vdev.sync_write_min_active 10 vfs.zfs.vdev.sync_read_max_active 10 vfs.zfs.vdev.sync_read_min_active 10 vfs.zfs.vdev.max_active 1000 vfs.zfs.vdev.async_write_active_max_dirty_percent60 vfs.zfs.vdev.async_write_active_min_dirty_percent30 vfs.zfs.vdev.mirror.non_rotating_seek_inc1 vfs.zfs.vdev.mirror.non_rotating_inc 0 vfs.zfs.vdev.mirror.rotating_seek_offset1048576 vfs.zfs.vdev.mirror.rotating_seek_inc 5 vfs.zfs.vdev.mirror.rotating_inc 0 vfs.zfs.vdev.trim_on_init 1 vfs.zfs.vdev.cache.bshift 16 vfs.zfs.vdev.cache.size 0 vfs.zfs.vdev.cache.max 16384 vfs.zfs.vdev.validate_skip 0 vfs.zfs.vdev.max_ms_shift 34 vfs.zfs.vdev.default_ms_shift 29 vfs.zfs.vdev.max_ms_count_limit 131072 vfs.zfs.vdev.min_ms_count 16 vfs.zfs.vdev.default_ms_count 200 vfs.zfs.txg.timeout 5 vfs.zfs.space_map_ibs 14 vfs.zfs.special_class_metadata_reserve_pct25 vfs.zfs.user_indirect_is_special 1 vfs.zfs.ddt_data_is_special 1 vfs.zfs.spa_allocators 4 vfs.zfs.spa_min_slop 134217728 vfs.zfs.spa_slop_shift 5 vfs.zfs.spa_asize_inflation 24 vfs.zfs.deadman_enabled 1 vfs.zfs.deadman_checktime_ms 5000 vfs.zfs.deadman_synctime_ms 1000000 vfs.zfs.debugflags 0 vfs.zfs.recover 0 vfs.zfs.spa_load_verify_data 1 vfs.zfs.spa_load_verify_metadata 1 vfs.zfs.spa_load_verify_maxinflight 10000 vfs.zfs.max_missing_tvds_scan 0 vfs.zfs.max_missing_tvds_cachefile 2 vfs.zfs.max_missing_tvds 0 vfs.zfs.spa_load_print_vdev_tree 0 vfs.zfs.ccw_retry_interval 300 vfs.zfs.check_hostid 1 vfs.zfs.multihost_fail_intervals 10 vfs.zfs.multihost_import_intervals 20 vfs.zfs.multihost_interval 1000 vfs.zfs.mg_fragmentation_threshold 85 vfs.zfs.mg_noalloc_threshold 0 vfs.zfs.condense_pct 200 vfs.zfs.metaslab_sm_blksz 4096 vfs.zfs.metaslab.bias_enabled 1 vfs.zfs.metaslab.lba_weighting_enabled 1 vfs.zfs.metaslab.fragmentation_factor_enabled1 vfs.zfs.metaslab.preload_enabled 1 vfs.zfs.metaslab.preload_limit 3 vfs.zfs.metaslab.unload_delay 8 vfs.zfs.metaslab.load_pct 50 vfs.zfs.metaslab.min_alloc_size 33554432 vfs.zfs.metaslab.df_free_pct 4 vfs.zfs.metaslab.df_alloc_threshold 131072 vfs.zfs.metaslab.debug_unload 0 vfs.zfs.metaslab.debug_load 0 vfs.zfs.metaslab.fragmentation_threshold70 vfs.zfs.metaslab.force_ganging 16777217 vfs.zfs.free_bpobj_enabled 1 vfs.zfs.free_max_blocks -1 vfs.zfs.zfs_scan_checkpoint_interval 7200 vfs.zfs.zfs_scan_legacy 0 vfs.zfs.no_scrub_prefetch 0 vfs.zfs.no_scrub_io 0 vfs.zfs.resilver_min_time_ms 3000 vfs.zfs.free_min_time_ms 1000 vfs.zfs.scan_min_time_ms 1000 vfs.zfs.scan_idle 50 vfs.zfs.scrub_delay 4 vfs.zfs.resilver_delay 2 vfs.zfs.zfetch.array_rd_sz 1048576 vfs.zfs.zfetch.max_idistance 67108864 vfs.zfs.zfetch.max_distance 8388608 vfs.zfs.zfetch.min_sec_reap 2 vfs.zfs.zfetch.max_streams 8 vfs.zfs.prefetch_disable 0 vfs.zfs.delay_scale 500000 vfs.zfs.delay_min_dirty_percent 60 vfs.zfs.dirty_data_sync_pct 20 vfs.zfs.dirty_data_max_percent 10 vfs.zfs.dirty_data_max_max 4294967296 vfs.zfs.dirty_data_max 4294967296 vfs.zfs.max_recordsize 1048576 vfs.zfs.default_ibs 17 vfs.zfs.default_bs 9 vfs.zfs.send_holes_without_birth_time 1 vfs.zfs.mdcomp_disable 0 vfs.zfs.per_txg_dirty_frees_percent 5 vfs.zfs.nopwrite_enabled 1 vfs.zfs.dedup.prefetch 1 vfs.zfs.dbuf_cache_lowater_pct 10 vfs.zfs.dbuf_cache_hiwater_pct 10 vfs.zfs.dbuf_metadata_cache_overflow 0 vfs.zfs.dbuf_metadata_cache_shift 6 vfs.zfs.dbuf_cache_shift 5 vfs.zfs.dbuf_metadata_cache_max_bytes 1025282816 vfs.zfs.dbuf_cache_max_bytes 2050565632 vfs.zfs.arc_min_prescient_prefetch_ms 6 vfs.zfs.arc_min_prefetch_ms 1 vfs.zfs.l2c_only_size 0 vfs.zfs.mfu_ghost_data_esize 7778263552 vfs.zfs.mfu_ghost_metadata_esize 16851792896 vfs.zfs.mfu_ghost_size 24630056448 vfs.zfs.mfu_data_esize 3059418112 vfs.zfs.mfu_metadata_esize 28641792 vfs.zfs.mfu_size 6399023104 vfs.zfs.mru_ghost_data_esize 2199812096 vfs.zfs.mru_ghost_metadata_esize 6289682432 vfs.zfs.mru_ghost_size 8489494528 vfs.zfs.mru_data_esize 22781456384 vfs.zfs.mru_metadata_esize 309155840 vfs.zfs.mru_size 23847875584 vfs.zfs.anon_data_esize 0 vfs.zfs.anon_metadata_esize 0 vfs.zfs.anon_size 8556544 vfs.zfs.l2arc_norw 1 vfs.zfs.l2arc_feed_again 1 vfs.zfs.l2arc_noprefetch 1 vfs.zfs.l2arc_feed_min_ms 200 vfs.zfs.l2arc_feed_secs 1 vfs.zfs.l2arc_headroom 2 vfs.zfs.l2arc_write_boost 8388608 vfs.zfs.l2arc_write_max 8388608 vfs.zfs.arc_meta_strategy 1 vfs.zfs.arc_meta_limit 15833624576 vfs.zfs.arc_free_target 346902 vfs.zfs.arc_kmem_cache_reap_retry_ms 1000 vfs.zfs.compressed_arc_enabled 1 vfs.zfs.arc_grow_retry 60 vfs.zfs.arc_shrink_shift 7 vfs.zfs.arc_average_blocksize 8192 vfs.zfs.arc_no_grow_shift 5 vfs.zfs.arc_min 8202262528 vfs.zfs.arc_max 39334498304 vfs.zfs.abd_chunk_size 4096 vfs.zfs.abd_scatter_enabled 1
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