fio output percentile latency seems upper bounded

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Hi, there

In fio output, sometimes I see tail percentile latency to be 17112760320, 
and it remains this value to 99.99%, why? Also, the mean latency is larger 
than this value? (intuitively, tail latency should be larger than mean 
latency...?) What's the reason and how to make it reasonable?

"clat_ns" : {
  ...
  "mean" : 41081227631.728256,
  ...
  "percentile" : {
    "1.000000" : 1669332992,
    "5.000000" : 10536091648,
    "10.000000" : 17112760320,
    "20.000000" : 17112760320,
    ...
    "99.950000" : 17112760320,
    "99.990000" : 17112760320
  }
},
"lat_ns" : {
  ...
  "mean" : 41087031313.177292,
  ...
}

Thank you
YL


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