Dec 292014
 

Here is the output for zfs-stats on slocum. This represents a 24 hour period. This server acts as my database server (MySQL and PostgreSQL), and runs bacula-dir, but does not store any backups locally. It also houses the dev copy of FreshPorts.

[dan@slocum:~] $ zfs-mon -baTI 86400
ZFS real-time cache activity monitor
Seconds elapsed: 86400

Cache hits and misses:
                                  1s    10s    60s    tot
                     ARC hits:    93    582    727   3266
                   ARC misses:    20     12     12    317
         ARC demand data hits:    55    165    572   1941
       ARC demand data misses:    20     12     12    238
     ARC demand metadata hits:    38    414    152   1021
   ARC demand metadata misses:     0      0      0     35
       ARC prefetch data hits:     0      2      2    226
     ARC prefetch data misses:     0      0      0     30
   ARC prefetch metadata hits:     0      1      1     78
 ARC prefetch metadata misses:     0      0      0     14
                  ZFETCH hits:   294    801   1621   5386
                ZFETCH misses:    43    690    489   1670

Cache efficiency percentage:
                          10s    60s    tot
                  ARC:  97.98  98.38  91.15
      ARC demand data:  93.22  97.95  89.08
  ARC demand metadata: 100.00 100.00  96.69
    ARC prefetch data: 100.00 100.00  88.28
ARC prefetch metadata: 100.00 100.00  84.78
               ZFETCH:  53.72  76.82  76.33
[dan@slocum:~] $ 
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