This output is from a T5240 w/64G memory.

Can anyone explain why the sum of the RSS column from prstat -Z is only around 
10G, but vmstat shows only 8G of my 64G as free?

ZONEID    NPROC  SWAP   RSS MEMORY      TIME  CPU ZONE
    30       40  776M  778M   1.2%   9:06:51 1.3% zone1
    33       72 8013M 3385M   5.2%  30:59:29 0.1% zone2
     0      127  577M  611M   0.9% 191:30:51 0.1% global
    38       48 1998M 1958M   3.0%   0:37:40 0.0% zone3
    34       36  207M  223M   0.3%   0:49:42 0.0% zone4
    16       33  298M  282M   0.4%   3:43:17 0.0% zone5
    12       83  692M  435M   0.7%   6:10:43 0.0% zone6
     1       52  273M  219M   0.3%  50:33:42 0.0% zone7
    25       40 1940M 1878M   2.9%  18:51:34 0.0% zone8
    13      106  823M  442M   0.7%   9:37:36 0.0% zone9

Total: 637 processes, 6970 lwps, load averages: 3.96, 8.44, 10.30
root at globalzone:[/export/home/username]# vmstat -p 3
     memory           page          executable      anonymous      filesystem
   swap  free  re  mf  fr  de  sr  epi  epo  epf  api  apo  apf  fpi  fpo  fpf
 88510216 30142216 183 815 6 0  0   26    0    0  794    0    0   47    7    6
 61581032 8646744 183 628 0 0   0  455    0    0 11012   0    0 4003    0    0
 60827024 8666760 459 1169 0 0  0  103    0    0 9304    0    0 3561    5    0
 60797904 8579056 215 541 51 0  0  228    0    0 24360   0    0 1297   51   51
 60748352 8455640 23 163 0  0   0   41    0    0 24470   0    0  954    0    0
 60737112 8489224 42 175 0  0   0  405    0    0 11149   0    0  705    0    0
 60735176 8620176 290 1351 0 0  0  213    0    0 6381    0    0 1000    0    0
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