Can you clarify what you mean by ZFS Write Performance Issues? A single
kstat isn't very helpful, at least not to me. Maybe a few over a couple
of seconds when you are hitting the write performance issue might be
beneficial. A "zpool iostat 1" may also be beneficial.
As far as the kstat data below, this is interesting. Number of times
ZFS had to throttle the ARC growth.
zfs:0:arcstats:memory_throttle_count 6508
Dave
On 02/03/11 08:31, Tony MacDoodle wrote:
We seem to be having write issues with zfs, does anyone see anything
in the following:
bash-3.00# kstat -p -n arcstats
zfs:0:arcstats:c 655251456
zfs:0:arcstats:c_max 5242011648
zfs:0:arcstats:c_min 655251456
zfs:0:arcstats:class misc
zfs:0:arcstats:crtime 5699201.4918501
zfs:0:arcstats:data_size 331404288
zfs:0:arcstats:deleted 408216
zfs:0:arcstats:demand_data_hits 4316945
zfs:0:arcstats:demand_data_misses 113229
zfs:0:arcstats:demand_metadata_hits 2250630
zfs:0:arcstats:demand_metadata_misses 94943
zfs:0:arcstats:evict_l2_cached 0
zfs:0:arcstats:evict_l2_eligible 21616669184
zfs:0:arcstats:evict_l2_ineligible 13499421184
zfs:0:arcstats:evict_skip 17589309
zfs:0:arcstats:hash_chain_max 5
zfs:0:arcstats:hash_chains 2403
zfs:0:arcstats:hash_collisions 288486
zfs:0:arcstats:hash_elements 26930
zfs:0:arcstats:hash_elements_max 54713
zfs:0:arcstats:hdr_size 5582496
zfs:0:arcstats:hits 6802606
zfs:0:arcstats:l2_abort_lowmem 0
zfs:0:arcstats:l2_cksum_bad 0
zfs:0:arcstats:l2_evict_lock_retry 0
zfs:0:arcstats:l2_evict_reading 0
zfs:0:arcstats:l2_feeds 0
zfs:0:arcstats:l2_free_on_write 0
zfs:0:arcstats:l2_hdr_size 0
zfs:0:arcstats:l2_hits 0
zfs:0:arcstats:l2_io_error 0
zfs:0:arcstats:l2_misses 0
zfs:0:arcstats:l2_read_bytes 0
zfs:0:arcstats:l2_rw_clash 0
zfs:0:arcstats:l2_size 0
zfs:0:arcstats:l2_write_bytes 0
zfs:0:arcstats:l2_writes_done 0
zfs:0:arcstats:l2_writes_error 0
zfs:0:arcstats:l2_writes_hdr_miss 0
zfs:0:arcstats:l2_writes_sent 0
zfs:0:arcstats:memory_throttle_count 6508
zfs:0:arcstats:mfu_ghost_hits 88648
zfs:0:arcstats:mfu_hits 5486801
zfs:0:arcstats:misses 451045
zfs:0:arcstats:mru_ghost_hits 79387
zfs:0:arcstats:mru_hits 1112447
zfs:0:arcstats:mutex_miss 367
zfs:0:arcstats:other_size 309580160
zfs:0:arcstats:p 630831672
zfs:0:arcstats:prefetch_data_hits 107952
zfs:0:arcstats:prefetch_data_misses 212200
zfs:0:arcstats:prefetch_metadata_hits 127079
zfs:0:arcstats:prefetch_metadata_misses 30673
zfs:0:arcstats:recycle_miss 209685
zfs:0:arcstats:size 646566944
zfs:0:arcstats:snaptime 5944007.85720004
Thanks
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