>Please send "zpool status" output. bash-3.2# zpool status Pool: rpool Status: ONLINE scrub: Keine erforderlich config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
c0t0d0s0 ONLINE 0 0 0
Fehler: Keine bekannten Datenfehler
Pool: zfs
Status: ONLINE
scrub: Keine erforderlich
config:
NAME STATE READ WRITE CKSUM
zfs ONLINE 0 0 0
c0t1d0s0 ONLINE 0 0 0
c0t0d0 is (hw) raid1 volume, c0t1d0 is raid5 volume
>Do me a favor - capture "kstat -n arcstats" before a test,
>after the write test and after the read test.
oh - no problem, you do ME a much bigger favor :)
here it is (i skipped the writes, as it`s not an issue with writes, imho)
1. after reboot, no read/write from/to raid5 volume:
bash-3.2# kstat -n arcstats
module: zfs instance: 0
name: arcstats class: misc
c 3214178304
c_max 3214178304
c_min 401772288
crtime 99,029660271
data_size 697647104
deleted 586
demand_data_hits 153452
demand_data_misses 3618
demand_metadata_hits 16991
demand_metadata_misses 1715
evict_skip 2033
hash_chain_max 2
hash_chains 955
hash_collisions 1168
hash_elements 11912
hash_elements_max 11912
hdr_size 2575056
hits 177667
l2_abort_lowmem 0
l2_cksum_bad 0
l2_evict_lock_retry 0
l2_evict_reading 0
l2_feeds 0
l2_free_on_write 0
l2_hdr_size 0
l2_hits 0
l2_io_error 0
l2_misses 0
l2_read_bytes 0
l2_rw_clash 0
l2_size 0
l2_write_bytes 0
l2_writes_done 0
l2_writes_error 0
l2_writes_hdr_miss 0
l2_writes_sent 0
memory_throttle_count 0
mfu_ghost_hits 28
mfu_hits 119832
misses 9631
mru_ghost_hits 43
mru_hits 50814
mutex_miss 0
other_size 7083016
p 1607424000
prefetch_data_hits 1110
prefetch_data_misses 1891
prefetch_metadata_hits 6114
prefetch_metadata_misses 2407
recycle_miss 0
size 707305176
snaptime 458,764228805
after dd if=/zfs/TESTFILE of=/dev/null (for a while) with prefetch enabled
bash-3.2# kstat -n arcstats
module: zfs instance: 0
name: arcstats class: misc
c 3214178304
c_max 3214178304
c_min 401772288
crtime 99,029660271
data_size 734903296
deleted 586
demand_data_hits 158353
demand_data_misses 3623
demand_metadata_hits 17332
demand_metadata_misses 1723
evict_skip 2033
hash_chain_max 2
hash_chains 983
hash_collisions 1205
hash_elements 12197
hash_elements_max 12201
hdr_size 2637408
hits 182942
l2_abort_lowmem 0
l2_cksum_bad 0
l2_evict_lock_retry 0
l2_evict_reading 0
l2_feeds 0
l2_free_on_write 0
l2_hdr_size 0
l2_hits 0
l2_io_error 0
l2_misses 0
l2_read_bytes 0
l2_rw_clash 0
l2_size 0
l2_write_bytes 0
l2_writes_done 0
l2_writes_error 0
l2_writes_hdr_miss 0
l2_writes_sent 0
memory_throttle_count 0
mfu_ghost_hits 28
mfu_hits 122813
misses 9925
mru_ghost_hits 43
mru_hits 53075
mutex_miss 0
other_size 7095040
p 1607424000
prefetch_data_hits 1110
prefetch_data_misses 2172
prefetch_metadata_hits 6147
prefetch_metadata_misses 2407
recycle_miss 0
size 744635744
snaptime 539,036512395
after some more reads, but with prefetch disabled:
bash-3.2# kstat -n arcstats
module: zfs instance: 0
name: arcstats class: misc
c 3214178304
c_max 3214178304
c_min 401772288
crtime 99,029660271
data_size 1302580736
deleted 587
demand_data_hits 1216573
demand_data_misses 7536
demand_metadata_hits 18364
demand_metadata_misses 1775
evict_skip 2033
hash_chain_max 3
hash_chains 1705
hash_collisions 1991
hash_elements 16603
hash_elements_max 16603
hdr_size 3586248
hits 1242199
l2_abort_lowmem 0
l2_cksum_bad 0
l2_evict_lock_retry 0
l2_evict_reading 0
l2_feeds 0
l2_free_on_write 0
l2_hdr_size 0
l2_hits 0
l2_io_error 0
l2_misses 0
l2_read_bytes 0
l2_rw_clash 0
l2_size 0
l2_write_bytes 0
l2_writes_done 0
l2_writes_error 0
l2_writes_hdr_miss 0
l2_writes_sent 0
memory_throttle_count 0
mfu_ghost_hits 28
mfu_hits 192719
misses 14322
mru_ghost_hits 43
mru_hits 1042421
mutex_miss 0
other_size 7991320
p 1607424000
prefetch_data_hits 1114
prefetch_data_misses 2602
prefetch_metadata_hits 6148
prefetch_metadata_misses 2409
recycle_miss 0
size 1314158304
snaptime 684,491556275
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