Here is the output for zfs-stats on knew. This represents a 24 hour period. This server receives backups (via bacula-sd) and runs regression testing in various jails for the Bacula project. As a little side venture, it also loads up each of my backed-up databases.
$ zfs-mon -baTI 86400
ZFS real-time cache activity monitor
Seconds elapsed: 86400
Cache hits and misses:
1s 10s 60s tot
ARC hits: 4 11 224 1486
ARC misses: 0 0 0 82
ARC demand data hits: 2 3 71 1059
ARC demand data misses: 0 0 0 19
ARC demand metadata hits: 2 8 153 334
ARC demand metadata misses: 0 0 0 8
ARC prefetch data hits: 0 0 0 26
ARC prefetch data misses: 0 0 0 53
ARC prefetch metadata hits: 0 0 1 66
ARC prefetch metadata misses: 0 0 0 2
ZFETCH hits: 10 37 356 4539
ZFETCH misses: 0 1 16 673
Cache efficiency percentage:
10s 60s tot
ARC: 100.00 100.00 94.77
ARC demand data: 100.00 100.00 98.24
ARC demand metadata: 100.00 100.00 97.66
ARC prefetch data: 0.00 0.00 32.91
ARC prefetch metadata: 0.00 100.00 97.06
ZFETCH: 97.37 95.70 87.09
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