mike tancsa wrote:
>Hi,
> Thanks for the response. Reply in line
>
>On 7/20/2020 9:04 AM, Ronald Klop wrote:
>> Hi,
>>
>> My first suggestion would be to remove a lot of snapshots. But that my
>> not match your business case.
>
>As its a backup server, its sort of the point to have all those snapshots.
I'm the last guy who should be commenting on ZFS, since I never use it.
However, it is my understanding that ZFS "pseudo automounts" each
snapshot when you go there, so I think that might be what is taking
so long (ie. not really meta data).
Of course I have no idea what might speed that up. I would be
tempted to look in ZFS for the "snapshot mounting code", in
case I could find an obvious problem...
rick
> Maybe you can provide more information about your setup:
> Amount of RAM, CPU?
64G, Xeon(R) CPU E3-1240 v6 @ 3.70GHz
> output of "zpool status"
# zpool status -x
all pools are healthy
> output of "zfs list" if possible to share
its a big list
# zfs list | wc
824 4120 107511
> Type of disks/ssds?
old school Device Model: WDC WD80EFAX-68KNBN0
> What is the load of the system? I/O per second, etc.
its not cpu bound, disks are sometimes running at 100% based on gstat,
but not always
> Do you use dedup, GELI?
no and no
> Something else special about the setup.
> output of "top -b"
>
ports are right now being built in a VM, but the problem (zrepl hanging)
and zfs list -t snapshots taking forever happens regardless
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU
COMMAND
4439 root 12 40 20 6167M 5762M kqread 3 535:13 200.00% bhyve
98783 root 2 21 0 16M 5136K hdr->b 4 0:01 1.95% zfs
76489 root 21 23 0 738M 54M uwait 1 2:18 0.88% zrepl
98784 root 1 21 0 13M 3832K piperd 3 0:01 0.59% zfs
99563 root 1 20 0 13M 4136K zio->i 4 0:00 0.39% zfs
16136 root 18 25 0 705M 56M uwait 3 29:58 0.00%
zrepl-freebsd-amd64
1845 root 1 20 0 12M 3772K nanslp 7 5:54 0.00%
ossec-syscheckd
1567 root 1 20 0 11M 2744K select 0 2:22 0.00%
syslogd
1737 root 32 20 0 11M 2844K rpcsvc 6 1:40 0.00% nfsd
1660 root 1 -52 r0 11M 11M nanslp 5 1:18 0.00%
watchdogd
1434 root 1 20 0 9988K 988K select 3 0:27 0.00% devd
2435 mdtancsa 1 20 0 20M 8008K select 0 0:21 0.00% sshd
1754 root 3 20 0 18M 3556K select 1 0:11 0.00%
apcupsd
5917 root 1 20 0 11M 2672K select 2 0:06 0.00%
script
1449 _pflogd 1 20 0 12M 3572K bpf 3 0:05 0.00%
pflogd
---Mike
> 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
>>
>> _______________________________________________
>> freebsd-stable@freebsd.org mailing list
>> https://lists.freebsd.org/mailman/listinfo/freebsd-stable
>> To unsubscribe, send any mail to
>> "freebsd-stable-unsubscr...@freebsd.org"
>>
>>
>>
> _______________________________________________
> freebsd-stable@freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-stable
> To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
>
_______________________________________________
freebsd-stable@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-stable
To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
_______________________________________________
freebsd-stable@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-stable
To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
