Dec 272014
 

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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