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ZFS pool arc_summary

viggy96
Jan 12th, 2025
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  1. ------------------------------------------------------------------------
  2. ZFS Subsystem Report Sun Jan 12 21:11:47 2025
  3. Linux 6.8.0-51-generic 2.2.2-0ubuntu9.1
  4. Machine: box (x86_64) 2.2.2-0ubuntu9.1
  5.  
  6. ARC status: HEALTHY
  7. Memory throttle count: 0
  8.  
  9. ARC size (current): 13.2 % 50.7 GiB
  10. Target size (adaptive): 66.7 % 256.0 GiB
  11. Min size (hard limit): 66.7 % 256.0 GiB
  12. Max size (high water): 1:1 384.0 GiB
  13. Anonymous data size: < 0.1 % 137.5 KiB
  14. Anonymous metadata size: < 0.1 % 1.6 MiB
  15. MFU data target: 37.5 % 18.3 GiB
  16. MFU data size: 37.4 % 18.3 GiB
  17. MFU ghost data size: 0 Bytes
  18. MFU metadata target: 12.5 % 6.1 GiB
  19. MFU metadata size: 2.4 % 1.2 GiB
  20. MFU ghost metadata size: 0 Bytes
  21. MRU data target: 37.5 % 18.3 GiB
  22. MRU data size: 15.4 % 7.5 GiB
  23. MRU ghost data size: 0 Bytes
  24. MRU metadata target: 12.5 % 6.1 GiB
  25. MRU metadata size: 44.8 % 21.9 GiB
  26. MRU ghost metadata size: 0 Bytes
  27. Uncached data size: 0.0 % 0 Bytes
  28. Uncached metadata size: 0.0 % 0 Bytes
  29. Bonus size: 0.1 % 46.1 MiB
  30. Dnode cache target: 10.0 % 38.4 GiB
  31. Dnode cache size: 0.4 % 148.5 MiB
  32. Dbuf size: 0.2 % 95.9 MiB
  33. Header size: 0.3 % 168.1 MiB
  34. L2 header size: 2.8 % 1.4 GiB
  35. ABD chunk waste size: < 0.1 % 11.9 MiB
  36.  
  37. ARC hash breakdown:
  38. Elements max: 16.4M
  39. Elements current: 100.0 % 16.4M
  40. Collisions: 2.0M
  41. Chain max: 6
  42. Chains: 1.7M
  43.  
  44. ARC misc:
  45. Deleted: 399
  46. Mutex misses: 0
  47. Eviction skips: 11
  48. Eviction skips due to L2 writes: 0
  49. L2 cached evictions: 0 Bytes
  50. L2 eligible evictions: 3.3 MiB
  51. L2 eligible MFU evictions: 7.1 % 240.5 KiB
  52. L2 eligible MRU evictions: 92.9 % 3.1 MiB
  53. L2 ineligible evictions: 4.0 KiB
  54.  
  55. ARC total accesses: 433.3M
  56. Total hits: 97.7 % 423.4M
  57. Total I/O hits: < 0.1 % 23.6k
  58. Total misses: 2.3 % 9.9M
  59.  
  60. ARC demand data accesses: 54.0 % 233.9M
  61. Demand data hits: 100.0 % 233.8M
  62. Demand data I/O hits: < 0.1 % 846
  63. Demand data misses: < 0.1 % 27.9k
  64.  
  65. ARC demand metadata accesses: 4.7 % 20.4M
  66. Demand metadata hits: 99.5 % 20.3M
  67. Demand metadata I/O hits: < 0.1 % 6.4k
  68. Demand metadata misses: 0.5 % 102.8k
  69.  
  70. ARC prefetch data accesses: < 0.1 % 141.1k
  71. Prefetch data hits: 23.9 % 33.8k
  72. Prefetch data I/O hits: 0.3 % 406
  73. Prefetch data misses: 75.8 % 106.9k
  74.  
  75. ARC prefetch metadata accesses: 41.3 % 179.0M
  76. Prefetch metadata hits: 94.6 % 169.3M
  77. Prefetch metadata I/O hits: < 0.1 % 15.9k
  78. Prefetch metadata misses: 5.4 % 9.7M
  79.  
  80. ARC predictive prefetches: 0.2 % 298.5k
  81. Demand hits after predictive: 31.6 % 94.4k
  82. Demand I/O hits after predictive: 3.0 % 9.1k
  83. Never demanded after predictive: 65.3 % 195.0k
  84.  
  85. ARC prescient prefetches: 99.8 % 178.8M
  86. Demand hits after prescient: 0.1 % 225.5k
  87. Demand I/O hits after prescient: < 0.1 % 4.7k
  88. Never demanded after prescient: 99.9 % 178.6M
  89.  
  90. ARC states hits of all accesses:
  91. Most frequently used (MFU): 60.5 % 262.3M
  92. Most recently used (MRU): 39.3 % 170.3M
  93. Most frequently used (MFU) ghost: 0.0 % 0
  94. Most recently used (MRU) ghost: 0.0 % 0
  95. Uncached: 0.0 % 0
  96.  
  97. DMU predictive prefetcher calls: 221.1M
  98. Stream hits: 0.4 % 776.0k
  99. Stream misses: 99.6 % 220.3M
  100. Streams limit reached: 99.9 % 220.1M
  101. Prefetches issued 136.5k
  102.  
  103. L2ARC status: HEALTHY
  104. Low memory aborts: 0
  105. Free on write: 1
  106. R/W clashes: 0
  107. Bad checksums: 0
  108. Read errors: 0
  109. Write errors: 0
  110.  
  111. L2ARC size (adaptive): 1.9 TiB
  112. Compressed: 98.2 % 1.8 TiB
  113. Header size: 0.1 % 1.4 GiB
  114. MFU allocated size: 9.5 % 177.4 GiB
  115. MRU allocated size: 85.8 % 1.6 TiB
  116. Prefetch allocated size: 4.6 % 86.6 GiB
  117. Data (buffer content) allocated size: 99.6 % 1.8 TiB
  118. Metadata (buffer content) allocated size: 0.4 % 7.6 GiB
  119.  
  120. L2ARC breakdown: 9.9M
  121. Hit ratio: 79.0 % 7.8M
  122. Miss ratio: 21.0 % 2.1M
  123.  
  124. L2ARC I/O:
  125. Reads: 126.5 GiB 7.8M
  126. Writes: 9.4 GiB 7.5k
  127.  
  128. L2ARC evicts:
  129. L1 cached: 789
  130. While reading: 0
  131.  
  132. Solaris Porting Layer (SPL):
  133. spl_hostid 0
  134. spl_hostid_path /etc/hostid
  135. spl_kmem_alloc_max 1048576
  136. spl_kmem_alloc_warn 65536
  137. spl_kmem_cache_kmem_threads 4
  138. spl_kmem_cache_magazine_size 0
  139. spl_kmem_cache_max_size 32
  140. spl_kmem_cache_obj_per_slab 8
  141. spl_kmem_cache_reclaim 0
  142. spl_kmem_cache_slab_limit 16384
  143. spl_max_show_tasks 512
  144. spl_panic_halt 0
  145. spl_schedule_hrtimeout_slack_us 0
  146. spl_taskq_kick 0
  147. spl_taskq_thread_bind 0
  148. spl_taskq_thread_dynamic 1
  149. spl_taskq_thread_priority 1
  150. spl_taskq_thread_sequential 4
  151. spl_taskq_thread_timeout_ms 10000
  152.  
  153. Tunables:
  154. dbuf_cache_hiwater_pct 10
  155. dbuf_cache_lowater_pct 10
  156. dbuf_cache_max_bytes 18446744073709551615
  157. dbuf_cache_shift 5
  158. dbuf_metadata_cache_max_bytes 18446744073709551615
  159. dbuf_metadata_cache_shift 6
  160. dbuf_mutex_cache_shift 0
  161. ddt_zap_default_bs 15
  162. ddt_zap_default_ibs 15
  163. dmu_object_alloc_chunk_shift 7
  164. dmu_prefetch_max 134217728
  165. icp_aes_impl cycle [fastest] generic x86_64 aesni
  166. icp_gcm_avx_chunk_size 32736
  167. icp_gcm_impl cycle [fastest] avx generic pclmulqdq
  168. ignore_hole_birth 1
  169. l2arc_exclude_special 0
  170. l2arc_feed_again 1
  171. l2arc_feed_min_ms 2
  172. l2arc_feed_secs 1
  173. l2arc_headroom 0
  174. l2arc_headroom_boost 200
  175. l2arc_meta_percent 33
  176. l2arc_mfuonly 0
  177. l2arc_noprefetch 0
  178. l2arc_norw 0
  179. l2arc_rebuild_blocks_min_l2size 1073741824
  180. l2arc_rebuild_enabled 1
  181. l2arc_trim_ahead 0
  182. l2arc_write_boost 8388608
  183. l2arc_write_max 8388608
  184. metaslab_aliquot 1048576
  185. metaslab_bias_enabled 1
  186. metaslab_debug_load 0
  187. metaslab_debug_unload 0
  188. metaslab_df_max_search 16777216
  189. metaslab_df_use_largest_segment 0
  190. metaslab_force_ganging 16777217
  191. metaslab_force_ganging_pct 3
  192. metaslab_fragmentation_factor_enabled 1
  193. metaslab_lba_weighting_enabled 1
  194. metaslab_preload_enabled 1
  195. metaslab_preload_limit 10
  196. metaslab_preload_pct 50
  197. metaslab_unload_delay 32
  198. metaslab_unload_delay_ms 600000
  199. send_holes_without_birth_time 1
  200. spa_asize_inflation 24
  201. spa_config_path /etc/zfs/zpool.cache
  202. spa_load_print_vdev_tree 0
  203. spa_load_verify_data 1
  204. spa_load_verify_metadata 1
  205. spa_load_verify_shift 4
  206. spa_slop_shift 5
  207. spa_upgrade_errlog_limit 0
  208. vdev_file_logical_ashift 9
  209. vdev_file_physical_ashift 9
  210. vdev_removal_max_span 32768
  211. vdev_validate_skip 0
  212. zap_iterate_prefetch 1
  213. zap_micro_max_size 131072
  214. zfetch_max_distance 67108864
  215. zfetch_max_idistance 67108864
  216. zfetch_max_sec_reap 2
  217. zfetch_max_streams 8
  218. zfetch_min_distance 4194304
  219. zfetch_min_sec_reap 1
  220. zfs_abd_scatter_enabled 1
  221. zfs_abd_scatter_max_order 9
  222. zfs_abd_scatter_min_size 1536
  223. zfs_admin_snapshot 0
  224. zfs_allow_redacted_dataset_mount 0
  225. zfs_arc_average_blocksize 8192
  226. zfs_arc_dnode_limit 0
  227. zfs_arc_dnode_limit_percent 10
  228. zfs_arc_dnode_reduce_percent 10
  229. zfs_arc_evict_batch_limit 10
  230. zfs_arc_eviction_pct 200
  231. zfs_arc_grow_retry 0
  232. zfs_arc_lotsfree_percent 10
  233. zfs_arc_max 412316860416
  234. zfs_arc_meta_balance 500
  235. zfs_arc_min 274877906944
  236. zfs_arc_min_prefetch_ms 0
  237. zfs_arc_min_prescient_prefetch_ms 0
  238. zfs_arc_pc_percent 0
  239. zfs_arc_prune_task_threads 1
  240. zfs_arc_shrink_shift 0
  241. zfs_arc_shrinker_limit 10000
  242. zfs_arc_sys_free 0
  243. zfs_async_block_max_blocks 18446744073709551615
  244. zfs_autoimport_disable 1
  245. zfs_bclone_enabled 0
  246. zfs_blake3_impl cycle [fastest] generic sse2 sse41 avx2
  247. zfs_brt_prefetch 1
  248. zfs_btree_verify_intensity 0
  249. zfs_checksum_events_per_second 20
  250. zfs_commit_timeout_pct 5
  251. zfs_compressed_arc_enabled 1
  252. zfs_condense_indirect_commit_entry_delay_ms 0
  253. zfs_condense_indirect_obsolete_pct 25
  254. zfs_condense_indirect_vdevs_enable 1
  255. zfs_condense_max_obsolete_bytes 1073741824
  256. zfs_condense_min_mapping_bytes 131072
  257. zfs_dbgmsg_enable 1
  258. zfs_dbgmsg_maxsize 4194304
  259. zfs_dbuf_state_index 0
  260. zfs_ddt_data_is_special 1
  261. zfs_deadman_checktime_ms 60000
  262. zfs_deadman_enabled 1
  263. zfs_deadman_failmode wait
  264. zfs_deadman_synctime_ms 600000
  265. zfs_deadman_ziotime_ms 300000
  266. zfs_dedup_prefetch 0
  267. zfs_default_bs 9
  268. zfs_default_ibs 17
  269. zfs_delay_min_dirty_percent 60
  270. zfs_delay_scale 500000
  271. zfs_delete_blocks 20480
  272. zfs_dirty_data_max 4294967296
  273. zfs_dirty_data_max_max 4294967296
  274. zfs_dirty_data_max_max_percent 25
  275. zfs_dirty_data_max_percent 10
  276. zfs_dirty_data_sync_percent 20
  277. zfs_disable_ivset_guid_check 0
  278. zfs_dmu_offset_next_sync 1
  279. zfs_embedded_slog_min_ms 64
  280. zfs_expire_snapshot 300
  281. zfs_fallocate_reserve_percent 110
  282. zfs_flags 0
  283. zfs_fletcher_4_impl [fastest] scalar superscalar superscalar4 sse2 ssse3 avx2
  284. zfs_free_bpobj_enabled 1
  285. zfs_free_leak_on_eio 0
  286. zfs_free_min_time_ms 1000
  287. zfs_history_output_max 1048576
  288. zfs_immediate_write_sz 32768
  289. zfs_initialize_chunk_size 1048576
  290. zfs_initialize_value 16045690984833335022
  291. zfs_keep_log_spacemaps_at_export 0
  292. zfs_key_max_salt_uses 400000000
  293. zfs_livelist_condense_new_alloc 0
  294. zfs_livelist_condense_sync_cancel 0
  295. zfs_livelist_condense_sync_pause 0
  296. zfs_livelist_condense_zthr_cancel 0
  297. zfs_livelist_condense_zthr_pause 0
  298. zfs_livelist_max_entries 500000
  299. zfs_livelist_min_percent_shared 75
  300. zfs_lua_max_instrlimit 100000000
  301. zfs_lua_max_memlimit 104857600
  302. zfs_max_async_dedup_frees 100000
  303. zfs_max_dataset_nesting 50
  304. zfs_max_log_walking 5
  305. zfs_max_logsm_summary_length 10
  306. zfs_max_missing_tvds 0
  307. zfs_max_nvlist_src_size 0
  308. zfs_max_recordsize 16777216
  309. zfs_metaslab_find_max_tries 100
  310. zfs_metaslab_fragmentation_threshold 70
  311. zfs_metaslab_max_size_cache_sec 3600
  312. zfs_metaslab_mem_limit 25
  313. zfs_metaslab_segment_weight_enabled 1
  314. zfs_metaslab_switch_threshold 2
  315. zfs_metaslab_try_hard_before_gang 0
  316. zfs_mg_fragmentation_threshold 95
  317. zfs_mg_noalloc_threshold 0
  318. zfs_min_metaslabs_to_flush 1
  319. zfs_multihost_fail_intervals 10
  320. zfs_multihost_history 0
  321. zfs_multihost_import_intervals 20
  322. zfs_multihost_interval 1000
  323. zfs_multilist_num_sublists 0
  324. zfs_no_scrub_io 0
  325. zfs_no_scrub_prefetch 0
  326. zfs_nocacheflush 0
  327. zfs_nopwrite_enabled 1
  328. zfs_object_mutex_size 64
  329. zfs_obsolete_min_time_ms 500
  330. zfs_override_estimate_recordsize 0
  331. zfs_pd_bytes_max 52428800
  332. zfs_per_txg_dirty_frees_percent 30
  333. zfs_prefetch_disable 0
  334. zfs_read_history 0
  335. zfs_read_history_hits 0
  336. zfs_rebuild_max_segment 1048576
  337. zfs_rebuild_scrub_enabled 1
  338. zfs_rebuild_vdev_limit 67108864
  339. zfs_reconstruct_indirect_combinations_max 4096
  340. zfs_recover 0
  341. zfs_recv_best_effort_corrective 0
  342. zfs_recv_queue_ff 20
  343. zfs_recv_queue_length 16777216
  344. zfs_recv_write_batch_size 1048576
  345. zfs_removal_ignore_errors 0
  346. zfs_removal_suspend_progress 0
  347. zfs_remove_max_segment 16777216
  348. zfs_resilver_disable_defer 0
  349. zfs_resilver_min_time_ms 3000
  350. zfs_scan_blkstats 0
  351. zfs_scan_checkpoint_intval 7200
  352. zfs_scan_fill_weight 3
  353. zfs_scan_ignore_errors 0
  354. zfs_scan_issue_strategy 0
  355. zfs_scan_legacy 0
  356. zfs_scan_max_ext_gap 2097152
  357. zfs_scan_mem_lim_fact 20
  358. zfs_scan_mem_lim_soft_fact 20
  359. zfs_scan_report_txgs 0
  360. zfs_scan_strict_mem_lim 0
  361. zfs_scan_suspend_progress 0
  362. zfs_scan_vdev_limit 16777216
  363. zfs_scrub_error_blocks_per_txg 4096
  364. zfs_scrub_min_time_ms 1000
  365. zfs_send_corrupt_data 0
  366. zfs_send_no_prefetch_queue_ff 20
  367. zfs_send_no_prefetch_queue_length 1048576
  368. zfs_send_queue_ff 20
  369. zfs_send_queue_length 16777216
  370. zfs_send_unmodified_spill_blocks 1
  371. zfs_sha256_impl cycle [fastest] generic x64 ssse3 avx avx2 shani
  372. zfs_sha512_impl cycle [fastest] generic x64 avx avx2
  373. zfs_slow_io_events_per_second 20
  374. zfs_snapshot_history_enabled 1
  375. zfs_spa_discard_memory_limit 16777216
  376. zfs_special_class_metadata_reserve_pct 25
  377. zfs_sync_pass_deferred_free 2
  378. zfs_sync_pass_dont_compress 8
  379. zfs_sync_pass_rewrite 2
  380. zfs_sync_taskq_batch_pct 75
  381. zfs_traverse_indirect_prefetch_limit 32
  382. zfs_trim_extent_bytes_max 134217728
  383. zfs_trim_extent_bytes_min 32768
  384. zfs_trim_metaslab_skip 0
  385. zfs_trim_queue_limit 10
  386. zfs_trim_txg_batch 32
  387. zfs_txg_history 100
  388. zfs_txg_timeout 5
  389. zfs_unflushed_log_block_max 131072
  390. zfs_unflushed_log_block_min 1000
  391. zfs_unflushed_log_block_pct 400
  392. zfs_unflushed_log_txg_max 1000
  393. zfs_unflushed_max_mem_amt 1073741824
  394. zfs_unflushed_max_mem_ppm 1000
  395. zfs_unlink_suspend_progress 0
  396. zfs_user_indirect_is_special 1
  397. zfs_vdev_aggregation_limit 1048576
  398. zfs_vdev_aggregation_limit_non_rotating 131072
  399. zfs_vdev_async_read_max_active 3
  400. zfs_vdev_async_read_min_active 1
  401. zfs_vdev_async_write_active_max_dirty_percent 60
  402. zfs_vdev_async_write_active_min_dirty_percent 30
  403. zfs_vdev_async_write_max_active 10
  404. zfs_vdev_async_write_min_active 2
  405. zfs_vdev_def_queue_depth 32
  406. zfs_vdev_default_ms_count 200
  407. zfs_vdev_default_ms_shift 29
  408. zfs_vdev_failfast_mask 1
  409. zfs_vdev_initializing_max_active 1
  410. zfs_vdev_initializing_min_active 1
  411. zfs_vdev_max_active 1000
  412. zfs_vdev_max_auto_ashift 14
  413. zfs_vdev_max_ms_shift 34
  414. zfs_vdev_min_auto_ashift 9
  415. zfs_vdev_min_ms_count 16
  416. zfs_vdev_mirror_non_rotating_inc 0
  417. zfs_vdev_mirror_non_rotating_seek_inc 1
  418. zfs_vdev_mirror_rotating_inc 0
  419. zfs_vdev_mirror_rotating_seek_inc 5
  420. zfs_vdev_mirror_rotating_seek_offset 1048576
  421. zfs_vdev_ms_count_limit 131072
  422. zfs_vdev_nia_credit 5
  423. zfs_vdev_nia_delay 5
  424. zfs_vdev_open_timeout_ms 1000
  425. zfs_vdev_queue_depth_pct 1000
  426. zfs_vdev_raidz_impl cycle [fastest] original scalar sse2 ssse3 avx2
  427. zfs_vdev_read_gap_limit 32768
  428. zfs_vdev_rebuild_max_active 3
  429. zfs_vdev_rebuild_min_active 1
  430. zfs_vdev_removal_max_active 2
  431. zfs_vdev_removal_min_active 1
  432. zfs_vdev_scheduler unused
  433. zfs_vdev_scrub_max_active 3
  434. zfs_vdev_scrub_min_active 1
  435. zfs_vdev_sync_read_max_active 10
  436. zfs_vdev_sync_read_min_active 10
  437. zfs_vdev_sync_write_max_active 10
  438. zfs_vdev_sync_write_min_active 10
  439. zfs_vdev_trim_max_active 2
  440. zfs_vdev_trim_min_active 1
  441. zfs_vdev_write_gap_limit 4096
  442. zfs_vnops_read_chunk_size 1048576
  443. zfs_wrlog_data_max 8589934592
  444. zfs_xattr_compat 0
  445. zfs_zevent_len_max 512
  446. zfs_zevent_retain_expire_secs 900
  447. zfs_zevent_retain_max 2000
  448. zfs_zil_clean_taskq_maxalloc 1048576
  449. zfs_zil_clean_taskq_minalloc 1024
  450. zfs_zil_clean_taskq_nthr_pct 100
  451. zfs_zil_saxattr 1
  452. zil_maxblocksize 131072
  453. zil_maxcopied 7680
  454. zil_min_commit_timeout 5000
  455. zil_nocacheflush 0
  456. zil_replay_disable 0
  457. zil_slog_bulk 67108864
  458. zio_deadman_log_all 0
  459. zio_dva_throttle_enabled 1
  460. zio_requeue_io_start_cut_in_line 1
  461. zio_slow_io_ms 30000
  462. zio_taskq_batch_pct 80
  463. zio_taskq_batch_tpq 0
  464. zio_taskq_read fixed,1,8 null scale null
  465. zio_taskq_write batch fixed,1,5 scale fixed,1,5
  466. zstd_abort_size 131072
  467. zstd_earlyabort_pass 1
  468. zvol_blk_mq_blocks_per_thread 8
  469. zvol_blk_mq_queue_depth 128
  470. zvol_enforce_quotas 1
  471. zvol_inhibit_dev 0
  472. zvol_major 230
  473. zvol_max_discard_blocks 16384
  474. zvol_open_timeout_ms 1000
  475. zvol_prefetch_bytes 131072
  476. zvol_request_sync 0
  477. zvol_threads 0
  478. zvol_use_blk_mq 0
  479. zvol_volmode 1
  480.  
  481. ZIL committed transactions: 1.5M
  482. Commit requests: 178.3k
  483. Flushes to stable storage: 176.2k
  484. Transactions to SLOG storage pool: 6.0 GiB 199.4k
  485. Transactions to non-SLOG storage pool: 7.6 KiB 2
  486.  
  487.  
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