Date: Tue, 03 Mar 2015 17:06:31 +0100 From: kenneth <kenneth@tornet10.dyndns.org> To: freebsd-bugs@freebsd.org Subject: L2ARC problems Message-ID: <54F5DC07.90200@tornet10.dyndns.org>
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When the L2ARC has filled up and is in use for a while problems like I/O
errors and Bad checksums.
The size of the L2ARC is only 80G. It looks like compression is used.
# uname -v
FreeBSD 10.1-RELEASE #0 r274401: Tue Nov 11 21:02:49 UTC 2014
root@releng1.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC
# zfs-stats -L
------------------------------------------------------------------------
ZFS Subsystem Report Tue Mar 3 16:54:36 2015
------------------------------------------------------------------------
L2 ARC Summary: (DEGRADED)
Passed Headroom: 59.38m
Tried Lock Failures: 7.80m
IO In Progress: 14.35k
Low Memory Aborts: 21
Free on Write: 27.55k
Writes While Full: 8.28k
R/W Clashes: 108
Bad Checksums: 14.48k
IO Errors: 12.88k
SPA Mismatch: 990.88k
L2 ARC Size: (Adaptive) 156.25 GiB
Header Size: 0.25% 405.65 MiB
L2 ARC Evicts:
Lock Retries: 145
Upon Reading: 0
L2 ARC Breakdown: 9.14m
Hit Ratio: 11.15% 1.02m
Miss Ratio: 88.85% 8.12m
Feeds: 2.53m
L2 ARC Buffer:
Bytes Scanned: 6.50 PiB
Buffer Iterations: 2.53m
List Iterations: 161.70m
NULL List Iterations: 340.27k
L2 ARC Writes:
Writes Sent: 100.00% 90.11k
# sysctl -a | grep l2
vfs.zfs.l2arc_write_max: 33554432
vfs.zfs.l2arc_write_boost: 67108864
vfs.zfs.l2arc_headroom: 2
vfs.zfs.l2arc_feed_secs: 1
vfs.zfs.l2arc_feed_min_ms: 200
vfs.zfs.l2arc_noprefetch: 1
vfs.zfs.l2arc_feed_again: 1
vfs.zfs.l2arc_norw: 1
vfs.zfs.l2c_only_size: 155331604480
vfs.cache.numfullpathfail2: 0
kstat.zfs.misc.arcstats.evict_l2_cached: 684731582464
kstat.zfs.misc.arcstats.evict_l2_eligible: 98364371968
kstat.zfs.misc.arcstats.evict_l2_ineligible: 31332678656
kstat.zfs.misc.arcstats.l2_hits: 1019237
kstat.zfs.misc.arcstats.l2_misses: 8123270
kstat.zfs.misc.arcstats.l2_feeds: 2527815
kstat.zfs.misc.arcstats.l2_rw_clash: 108
kstat.zfs.misc.arcstats.l2_read_bytes: 15603715072
kstat.zfs.misc.arcstats.l2_write_bytes: 351871377408
kstat.zfs.misc.arcstats.l2_writes_sent: 90108
kstat.zfs.misc.arcstats.l2_writes_done: 90108
kstat.zfs.misc.arcstats.l2_writes_error: 0
kstat.zfs.misc.arcstats.l2_writes_hdr_miss: 321
kstat.zfs.misc.arcstats.l2_evict_lock_retry: 145
kstat.zfs.misc.arcstats.l2_evict_reading: 0
kstat.zfs.misc.arcstats.l2_free_on_write: 27554
kstat.zfs.misc.arcstats.l2_abort_lowmem: 21
kstat.zfs.misc.arcstats.l2_cksum_bad: 14482
kstat.zfs.misc.arcstats.l2_io_error: 12877
kstat.zfs.misc.arcstats.l2_size: 167769063936
kstat.zfs.misc.arcstats.l2_asize: 163325760512
kstat.zfs.misc.arcstats.l2_hdr_size: 425358688
kstat.zfs.misc.arcstats.l2_compress_successes: 1048332
kstat.zfs.misc.arcstats.l2_compress_zeros: 0
kstat.zfs.misc.arcstats.l2_compress_failures: 876054
kstat.zfs.misc.arcstats.l2_write_trylock_fail: 7795393
kstat.zfs.misc.arcstats.l2_write_passed_headroom: 59396052
kstat.zfs.misc.arcstats.l2_write_spa_mismatch: 990877
kstat.zfs.misc.arcstats.l2_write_in_l2: 142082046580
kstat.zfs.misc.arcstats.l2_write_io_in_progress: 14352
kstat.zfs.misc.arcstats.l2_write_not_cacheable: 116138067597
kstat.zfs.misc.arcstats.l2_write_full: 8276
kstat.zfs.misc.arcstats.l2_write_buffer_iter: 2527815
kstat.zfs.misc.arcstats.l2_write_pios: 90108
kstat.zfs.misc.arcstats.l2_write_buffer_bytes_scanned: 7317667389325824
kstat.zfs.misc.arcstats.l2_write_buffer_list_iter: 161682755
kstat.zfs.misc.arcstats.l2_write_buffer_list_null_iter: 340271
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