Ubuntu 16.04LTS でZFSを試してみる(2)

さて、前回でUbuntu16.04LTSに ZFSを入れてみたわけですが、ZFSのモジュールがどうなってるか見てみましょう。

modinfo zfsすると、いろいろ情報がわかります。licenseがCDDLになっていて、AuthorがOpenZFS on Linx ということが分かります。

root@smiyaza-VirtualBox:~# modinfo zfs
filename:       /lib/modules/4.4.0-21-generic/kernel/zfs/zfs/zfs.ko
license:        CDDL
author:         OpenZFS on Linux
description:    ZFS
srcversion:     A87B4C0C518AC85BD042501
depends:        spl,znvpair,zunicode,zcommon,zavl
vermagic:       4.4.0-21-generic SMP mod_unload modversions 
parm:           zvol_inhibit_dev:Do not create zvol device nodes (uint)
parm:           zvol_major:Major number for zvol device (uint)
parm:           zvol_max_discard_blocks:Max number of blocks to discard (ulong)
parm:           zvol_prefetch_bytes:Prefetch N bytes at zvol start+end (uint)
parm:           zio_delay_max:Max zio millisec delay before posting event (int)
parm:           zio_requeue_io_start_cut_in_line:Prioritize requeued I/O (int)
parm:           zfs_sync_pass_deferred_free:Defer frees starting in this pass (int)
parm:           zfs_sync_pass_dont_compress:Don't compress starting in this pass (int)
parm:           zfs_sync_pass_rewrite:Rewrite new bps starting in this pass (int)
parm:           zil_replay_disable:Disable intent logging replay (int)
parm:           zfs_nocacheflush:Disable cache flushes (int)
parm:           zil_slog_limit:Max commit bytes to separate log device (ulong)
parm:           zfs_object_mutex_size:Size of znode hold array (uint)
parm:           zfs_read_chunk_size:Bytes to read per chunk (long)
parm:           zfs_immediate_write_sz:Largest data block to write to zil (long)
parm:           zfs_dbgmsg_enable:Enable ZFS debug message log (int)
parm:           zfs_dbgmsg_maxsize:Maximum ZFS debug log size (int)
parm:           zfs_admin_snapshot:Enable mkdir/rmdir/mv in .zfs/snapshot (int)
parm:           zfs_expire_snapshot:Seconds to expire .zfs/snapshot (int)
parm:           zfs_vdev_aggregation_limit:Max vdev I/O aggregation size (int)
parm:           zfs_vdev_read_gap_limit:Aggregate read I/O over gap (int)
parm:           zfs_vdev_write_gap_limit:Aggregate write I/O over gap (int)
parm:           zfs_vdev_max_active:Maximum number of active I/Os per vdev (int)
parm:           zfs_vdev_async_write_active_max_dirty_percent:Async write concurrency max threshold (int)
parm:           zfs_vdev_async_write_active_min_dirty_percent:Async write concurrency min threshold (int)
parm:           zfs_vdev_async_read_max_active:Max active async read I/Os per vdev (int)
parm:           zfs_vdev_async_read_min_active:Min active async read I/Os per vdev (int)
parm:           zfs_vdev_async_write_max_active:Max active async write I/Os per vdev (int)
parm:           zfs_vdev_async_write_min_active:Min active async write I/Os per vdev (int)
parm:           zfs_vdev_scrub_max_active:Max active scrub I/Os per vdev (int)
parm:           zfs_vdev_scrub_min_active:Min active scrub I/Os per vdev (int)
parm:           zfs_vdev_sync_read_max_active:Max active sync read I/Os per vdev (int)
parm:           zfs_vdev_sync_read_min_active:Min active sync read I/Os per vdev (int)
parm:           zfs_vdev_sync_write_max_active:Max active sync write I/Os per vdev (int)
parm:           zfs_vdev_sync_write_min_active:Min active sync write I/Os per vdev (int)
parm:           zfs_vdev_mirror_switch_us:Switch mirrors every N usecs (int)
parm:           zfs_vdev_scheduler:I/O scheduler (charp)
parm:           zfs_vdev_cache_max:Inflate reads small than max (int)
parm:           zfs_vdev_cache_size:Total size of the per-disk cache (int)
parm:           zfs_vdev_cache_bshift:Shift size to inflate reads too (int)
parm:           metaslabs_per_vdev:Divide added vdev into approximately (but no more than) this number of metaslabs (int)
parm:           zfs_txg_timeout:Max seconds worth of delta per txg (int)
parm:           zfs_read_history:Historic statistics for the last N reads (int)
parm:           zfs_read_history_hits:Include cache hits in read history (int)
parm:           zfs_txg_history:Historic statistics for the last N txgs (int)
parm:           zfs_flags:Set additional debugging flags (uint)
parm:           zfs_recover:Set to attempt to recover from fatal errors (int)
parm:           zfs_free_leak_on_eio:Set to ignore IO errors during free and permanently leak the space (int)
parm:           zfs_deadman_synctime_ms:Expiration time in milliseconds (ulong)
parm:           zfs_deadman_enabled:Enable deadman timer (int)
parm:           spa_asize_inflation:SPA size estimate multiplication factor (int)
parm:           spa_slop_shift:Reserved free space in pool (int)
parm:           spa_config_path:SPA config file (/etc/zfs/zpool.cache) (charp)
parm:           zfs_autoimport_disable:Disable pool import at module load (int)
parm:           spa_load_verify_maxinflight:Max concurrent traversal I/Os while verifying pool during import -X (int)
parm:           spa_load_verify_metadata:Set to traverse metadata on pool import (int)
parm:           spa_load_verify_data:Set to traverse data on pool import (int)
parm:           zio_taskq_batch_pct:Percentage of CPUs to run an IO worker thread (uint)
parm:           metaslab_aliquot:allocation granularity (a.k.a. stripe size) (ulong)
parm:           metaslab_debug_load:load all metaslabs when pool is first opened (int)
parm:           metaslab_debug_unload:prevent metaslabs from being unloaded (int)
parm:           metaslab_preload_enabled:preload potential metaslabs during reassessment (int)
parm:           zfs_mg_noalloc_threshold:percentage of free space for metaslab group to allow allocation (int)
parm:           zfs_mg_fragmentation_threshold:fragmentation for metaslab group to allow allocation (int)
parm:           zfs_metaslab_fragmentation_threshold:fragmentation for metaslab to allow allocation (int)
parm:           metaslab_fragmentation_factor_enabled:use the fragmentation metric to prefer less fragmented metaslabs (int)
parm:           metaslab_lba_weighting_enabled:prefer metaslabs with lower LBAs (int)
parm:           metaslab_bias_enabled:enable metaslab group biasing (int)
parm:           zfs_zevent_len_max:Max event queue length (int)
parm:           zfs_zevent_cols:Max event column width (int)
parm:           zfs_zevent_console:Log events to the console (int)
parm:           zfs_top_maxinflight:Max I/Os per top-level (int)
parm:           zfs_resilver_delay:Number of ticks to delay resilver (int)
parm:           zfs_scrub_delay:Number of ticks to delay scrub (int)
parm:           zfs_scan_idle:Idle window in clock ticks (int)
parm:           zfs_scan_min_time_ms:Min millisecs to scrub per txg (int)
parm:           zfs_free_min_time_ms:Min millisecs to free per txg (int)
parm:           zfs_resilver_min_time_ms:Min millisecs to resilver per txg (int)
parm:           zfs_no_scrub_io:Set to disable scrub I/O (int)
parm:           zfs_no_scrub_prefetch:Set to disable scrub prefetching (int)
parm:           zfs_free_max_blocks:Max number of blocks freed in one txg (ulong)
parm:           zfs_dirty_data_max_percent:percent of ram can be dirty (int)
parm:           zfs_dirty_data_max_max_percent:zfs_dirty_data_max upper bound as % of RAM (int)
parm:           zfs_delay_min_dirty_percent:transaction delay threshold (int)
parm:           zfs_dirty_data_max:determines the dirty space limit (ulong)
parm:           zfs_dirty_data_max_max:zfs_dirty_data_max upper bound in bytes (ulong)
parm:           zfs_dirty_data_sync:sync txg when this much dirty data (ulong)
parm:           zfs_delay_scale:how quickly delay approaches infinity (ulong)
parm:           zfs_max_recordsize:Max allowed record size (int)
parm:           zfs_prefetch_disable:Disable all ZFS prefetching (int)
parm:           zfetch_max_streams:Max number of streams per zfetch (uint)
parm:           zfetch_min_sec_reap:Min time before stream reclaim (uint)
parm:           zfetch_block_cap:Max number of blocks to fetch at a time (uint)
parm:           zfetch_array_rd_sz:Number of bytes in a array_read (ulong)
parm:           zfs_pd_bytes_max:Max number of bytes to prefetch (int)
parm:           zfs_send_corrupt_data:Allow sending corrupt data (int)
parm:           zfs_mdcomp_disable:Disable meta data compression (int)
parm:           zfs_nopwrite_enabled:Enable NOP writes (int)
parm:           zfs_dedup_prefetch:Enable prefetching dedup-ed blks (int)
parm:           zfs_dbuf_state_index:Calculate arc header index (int)
parm:           zfs_arc_min:Min arc size (ulong)
parm:           zfs_arc_max:Max arc size (ulong)
parm:           zfs_arc_meta_limit:Meta limit for arc size (ulong)
parm:           zfs_arc_meta_min:Min arc metadata (ulong)
parm:           zfs_arc_meta_prune:Meta objects to scan for prune (int)
parm:           zfs_arc_meta_adjust_restarts:Limit number of restarts in arc_adjust_meta (int)
parm:           zfs_arc_meta_strategy:Meta reclaim strategy (int)
parm:           zfs_arc_grow_retry:Seconds before growing arc size (int)
parm:           zfs_arc_p_aggressive_disable:disable aggressive arc_p grow (int)
parm:           zfs_arc_p_dampener_disable:disable arc_p adapt dampener (int)
parm:           zfs_arc_shrink_shift:log2(fraction of arc to reclaim) (int)
parm:           zfs_arc_p_min_shift:arc_c shift to calc min/max arc_p (int)
parm:           zfs_disable_dup_eviction:disable duplicate buffer eviction (int)
parm:           zfs_arc_average_blocksize:Target average block size (int)
parm:           zfs_arc_min_prefetch_lifespan:Min life of prefetch block (int)
parm:           zfs_arc_num_sublists_per_state:Number of sublists used in each of the ARC state lists (int)
parm:           l2arc_write_max:Max write bytes per interval (ulong)
parm:           l2arc_write_boost:Extra write bytes during device warmup (ulong)
parm:           l2arc_headroom:Number of max device writes to precache (ulong)
parm:           l2arc_headroom_boost:Compressed l2arc_headroom multiplier (ulong)
parm:           l2arc_feed_secs:Seconds between L2ARC writing (ulong)
parm:           l2arc_feed_min_ms:Min feed interval in milliseconds (ulong)
parm:           l2arc_noprefetch:Skip caching prefetched buffers (int)
parm:           l2arc_nocompress:Skip compressing L2ARC buffers (int)
parm:           l2arc_feed_again:Turbo L2ARC warmup (int)
parm:           l2arc_norw:No reads during writes (int)
parm:           zfs_arc_lotsfree_percent:System free memory I/O throttle in bytes (int)
parm:           zfs_arc_sys_free:System free memory target size in bytes (ulong)

ZFSのカーネルパラメータは、/proc/spl/kstat/zfs にまとまっています。
気になるのはARC(Adaptice Repacement Cache)あたりですかね。

root@smiyaza-VirtualBox:~# ls -1F /proc/spl/kstat/zfs/
root@smiyaza-VirtualBox:~# cat /proc/spl/kstat/zfs/arcstats 
6 1 0x01 91 4368 7680316308 4438954954082
name                            type data
hits                            4    49
misses                          4    212
demand_data_hits                4    0
demand_data_misses              4    0
demand_metadata_hits            4    49
demand_metadata_misses          4    212
prefetch_data_hits              4    0
prefetch_data_misses            4    0
prefetch_metadata_hits          4    0
prefetch_metadata_misses        4    0
mru_hits                        4    17
mru_ghost_hits                  4    0
mfu_hits                        4    32
mfu_ghost_hits                  4    0
deleted                         4    0
mutex_miss                      4    0
evict_skip                      4    0
evict_not_enough                4    0
evict_l2_cached                 4    0
evict_l2_eligible               4    0
evict_l2_ineligible             4    0
evict_l2_skip                   4    0
hash_elements                   4    24
hash_elements_max               4    24
hash_collisions                 4    0
hash_chains                     4    0
hash_chain_max                  4    0
p                               4    260180992
c                               4    520361984
c_min                           4    33554432
c_max                           4    520361984
size                            4    474248
hdr_size                        4    10600
data_size                       4    0
metadata_size                   4    401920
other_size                      4    61728
anon_size                       4    16384
anon_evictable_data             4    0
anon_evictable_metadata         4    0
mru_size                        4    233984
mru_evictable_data              4    0
mru_evictable_metadata          4    199168
mru_ghost_size                  4    0
mru_ghost_evictable_data        4    0
mru_ghost_evictable_metadata    4    0
mfu_size                        4    151552
mfu_evictable_data              4    0
mfu_evictable_metadata          4    34816
mfu_ghost_size                  4    0
mfu_ghost_evictable_data        4    0
mfu_ghost_evictable_metadata    4    0
l2_hits                         4    0
l2_misses                       4    0
l2_feeds                        4    0
l2_rw_clash                     4    0
l2_read_bytes                   4    0
l2_write_bytes                  4    0
l2_writes_sent                  4    0
l2_writes_done                  4    0
l2_writes_error                 4    0
l2_writes_lock_retry            4    0
l2_evict_lock_retry             4    0
l2_evict_reading                4    0
l2_evict_l1cached               4    0
l2_free_on_write                4    0
l2_cdata_free_on_write          4    0
l2_abort_lowmem                 4    0
l2_cksum_bad                    4    0
l2_io_error                     4    0
l2_size                         4    0
l2_asize                        4    0
l2_hdr_size                     4    0
l2_compress_successes           4    0
l2_compress_zeros               4    0
l2_compress_failures            4    0
memory_throttle_count           4    0
duplicate_buffers               4    0
duplicate_buffers_size          4    0
duplicate_reads                 4    0
memory_direct_count             4    0
memory_indirect_count           4    0
arc_no_grow                     4    0
arc_tempreserve                 4    0
arc_loaned_bytes                4    0
arc_prune                       4    0
arc_meta_used                   4    474248
arc_meta_limit                  4    390271488
arc_meta_max                    4    505504
arc_meta_min                    4    16777216
arc_need_free                   4    0
arc_sys_free                    4    16261120
root@smiyaza-VirtualBox:~# free
              total        used        free      shared  buff/cache   available
Mem:        1016332      544316       53092        3080      418924      428156
Swap:       1046524       44488     1002036



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