Hi,
My first suggestion would be to remove a lot of snapshots. But that my not
match your business case.
Maybe you can provide more information about your setup:
Amount of RAM, CPU?
output of "zpool status"
output of "zfs list" if possible to share
Type of disks/ssds?
What is the load of the system? I/O per second, etc.
Do you use dedup, GELI?
Something else special about the setup.
output of "top -b"
That kind of information.
Regards,
Ronald.
Van: mike tancsa <m...@sentex.net>
Datum: zondag, 19 juli 2020 16:17
Aan: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org>
Onderwerp: zfs meta data slowness
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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