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Add a collector for ZFS, currently focussed on ARC stats.

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It is tested on FreeBSD 10.2-RELEASE and Linux (ZFS on Linux 0.6.5.4).

On FreeBSD, Solaris, etc. ZFS metrics are exposed through sysctls.
ZFS on Linux exposes the same metrics through procfs `/proc/spl/...`.

In addition to sysctl metrics, 'computed metrics' are exposed by
the collector, which are based on several sysctl values.
There is some conditional logic involved in computing these metrics
which cannot be easily mapped to PromQL.

Not all 92 ARC sysctls are exposed right now but this can be changed
with one additional LOC each.
This commit is contained in:
Christian Schwarz 2016-02-25 13:55:02 +01:00 • committed by Joe Handzik
commit f29f3873ea
10 changed files with 678 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

93
collector/fixtures/proc/spl/kstat/zfs/arcstats Normal file
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6 1 0x01 91 4368 5266997922 97951858082072
name type data
hits 4 8772612
misses 4 604635
demand_data_hits 4 7221032
demand_data_misses 4 73300
demand_metadata_hits 4 1464353
demand_metadata_misses 4 498170
prefetch_data_hits 4 3615
prefetch_data_misses 4 17094
prefetch_metadata_hits 4 83612
prefetch_metadata_misses 4 16071
mru_hits 4 855535
mru_ghost_hits 4 21100
mfu_hits 4 7829854
mfu_ghost_hits 4 821
deleted 4 60403
mutex_miss 4 2
evict_skip 4 2265729
evict_not_enough 4 680
evict_l2_cached 4 0
evict_l2_eligible 4 8992514560
evict_l2_ineligible 4 992552448
evict_l2_skip 4 0
hash_elements 4 42359
hash_elements_max 4 88245
hash_collisions 4 50564
hash_chains 4 412
hash_chain_max 4 3
p 4 516395305
c 4 1643208777
c_min 4 33554432
c_max 4 8367976448
size 4 1603939792
hdr_size 4 16361080
data_size 4 1295836160
metadata_size 4 175298560
other_size 4 116443992
anon_size 4 1917440
anon_evictable_data 4 0
anon_evictable_metadata 4 0
mru_size 4 402593792
mru_evictable_data 4 278091264
mru_evictable_metadata 4 18606592
mru_ghost_size 4 999728128
mru_ghost_evictable_data 4 883765248
mru_ghost_evictable_metadata 4 115962880
mfu_size 4 1066623488
mfu_evictable_data 4 1017613824
mfu_evictable_metadata 4 9163776
mfu_ghost_size 4 104936448
mfu_ghost_evictable_data 4 96731136
mfu_ghost_evictable_metadata 4 8205312
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 4 542
memory_indirect_count 4 3006
arc_no_grow 4 0
arc_tempreserve 4 0
arc_loaned_bytes 4 0
arc_prune 4 0
arc_meta_used 4 308103632
arc_meta_limit 4 6275982336
arc_meta_max 4 449286096
arc_meta_min 4 16777216
arc_need_free 4 0
arc_sys_free 4 261496832

78
collector/fixtures/sysctl/freebsd/kstat.zfs.misc.arcstats.txt Normal file
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kstat.zfs.misc.arcstats.arc_meta_max: 1503210048
kstat.zfs.misc.arcstats.arc_meta_limit: 393216000
kstat.zfs.misc.arcstats.arc_meta_used: 392649848
kstat.zfs.misc.arcstats.duplicate_reads: 0
kstat.zfs.misc.arcstats.duplicate_buffers_size: 0
kstat.zfs.misc.arcstats.duplicate_buffers: 0
kstat.zfs.misc.arcstats.memory_throttle_count: 0
kstat.zfs.misc.arcstats.l2_write_buffer_list_null_iter: 0
kstat.zfs.misc.arcstats.l2_write_buffer_list_iter: 0
kstat.zfs.misc.arcstats.l2_write_buffer_bytes_scanned: 0
kstat.zfs.misc.arcstats.l2_write_pios: 0
kstat.zfs.misc.arcstats.l2_write_buffer_iter: 0
kstat.zfs.misc.arcstats.l2_write_full: 0
kstat.zfs.misc.arcstats.l2_write_not_cacheable: 29425
kstat.zfs.misc.arcstats.l2_write_io_in_progress: 0
kstat.zfs.misc.arcstats.l2_write_in_l2: 0
kstat.zfs.misc.arcstats.l2_write_spa_mismatch: 0
kstat.zfs.misc.arcstats.l2_write_passed_headroom: 0
kstat.zfs.misc.arcstats.l2_write_trylock_fail: 0
kstat.zfs.misc.arcstats.l2_compress_failures: 0
kstat.zfs.misc.arcstats.l2_compress_zeros: 0
kstat.zfs.misc.arcstats.l2_compress_successes: 0
kstat.zfs.misc.arcstats.l2_hdr_size: 0
kstat.zfs.misc.arcstats.l2_asize: 0
kstat.zfs.misc.arcstats.l2_size: 0
kstat.zfs.misc.arcstats.l2_io_error: 0
kstat.zfs.misc.arcstats.l2_cksum_bad: 0
kstat.zfs.misc.arcstats.l2_abort_lowmem: 0
kstat.zfs.misc.arcstats.l2_cdata_free_on_write: 0
kstat.zfs.misc.arcstats.l2_free_on_write: 0
kstat.zfs.misc.arcstats.l2_evict_reading: 0
kstat.zfs.misc.arcstats.l2_evict_lock_retry: 0
kstat.zfs.misc.arcstats.l2_writes_hdr_miss: 0
kstat.zfs.misc.arcstats.l2_writes_error: 0
kstat.zfs.misc.arcstats.l2_writes_done: 0
kstat.zfs.misc.arcstats.l2_writes_sent: 0
kstat.zfs.misc.arcstats.l2_write_bytes: 0
kstat.zfs.misc.arcstats.l2_read_bytes: 0
kstat.zfs.misc.arcstats.l2_rw_clash: 0
kstat.zfs.misc.arcstats.l2_feeds: 0
kstat.zfs.misc.arcstats.l2_misses: 0
kstat.zfs.misc.arcstats.l2_hits: 0
kstat.zfs.misc.arcstats.other_size: 166832272
kstat.zfs.misc.arcstats.data_size: 1200779776
kstat.zfs.misc.arcstats.hdr_size: 27244008
kstat.zfs.misc.arcstats.size: 1394856056
kstat.zfs.misc.arcstats.c_max: 1572864000
kstat.zfs.misc.arcstats.c_min: 196608000
kstat.zfs.misc.arcstats.c: 1470553736
kstat.zfs.misc.arcstats.p: 665524427
kstat.zfs.misc.arcstats.hash_chain_max: 7
kstat.zfs.misc.arcstats.hash_chains: 14180
kstat.zfs.misc.arcstats.hash_collisions: 2180398
kstat.zfs.misc.arcstats.hash_elements_max: 238188
kstat.zfs.misc.arcstats.hash_elements: 111458
kstat.zfs.misc.arcstats.evict_l2_ineligible: 60262400
kstat.zfs.misc.arcstats.evict_l2_eligible: 35702978560
kstat.zfs.misc.arcstats.evict_l2_cached: 0
kstat.zfs.misc.arcstats.evict_skip: 21716568
kstat.zfs.misc.arcstats.mutex_miss: 873
kstat.zfs.misc.arcstats.recycle_miss: 5018771
kstat.zfs.misc.arcstats.stolen: 1327563
kstat.zfs.misc.arcstats.deleted: 1187256
kstat.zfs.misc.arcstats.allocated: 10150518
kstat.zfs.misc.arcstats.mfu_ghost_hits: 1408986
kstat.zfs.misc.arcstats.mfu_hits: 51952454
kstat.zfs.misc.arcstats.mru_ghost_hits: 696819
kstat.zfs.misc.arcstats.mru_hits: 11115835
kstat.zfs.misc.arcstats.prefetch_metadata_misses: 32
kstat.zfs.misc.arcstats.prefetch_metadata_hits: 2
kstat.zfs.misc.arcstats.prefetch_data_misses: 0
kstat.zfs.misc.arcstats.prefetch_data_hits: 0
kstat.zfs.misc.arcstats.demand_metadata_misses: 9231542
kstat.zfs.misc.arcstats.demand_metadata_hits: 40650947
kstat.zfs.misc.arcstats.demand_data_misses: 75230
kstat.zfs.misc.arcstats.demand_data_hits: 22417340
kstat.zfs.misc.arcstats.misses: 9306804
kstat.zfs.misc.arcstats.hits: 63068289

12
collector/fixtures/zfs/zpool_stats_stdout.txt Normal file
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trout size 4294967296 -
trout free 1040117248 -
trout allocated 70144 -
trout capacity 0% -
trout dedupratio 1.00x -
trout fragmentation 0% -
zroot size 118111600640 -
zroot free 3990917120 -
zroot allocated 114120683520 -
zroot capacity 50% -
zroot dedupratio 1.00x -
zroot fragmentation 67% -