Bug 762468 (GLUSTER-736)

Dbench exits with an error with an 'Unknown error' on a Distribute+Replicate setup with all the performance translators except Statprefetch.

bash-3.2# dbench -s 10
dbench version 4.00 - Copyright Andrew Tridgell 1999-2004

Running for 600 seconds with load '/usr/local/share/client.txt' and minimum warmup 120 secs
10 of 10 processes prepared for launch   0 sec
releasing clients
   9        23     5.75 MB/sec  warmup   1 sec  latency 72.569 ms
  10        37     6.94 MB/sec  warmup   2 sec  latency 399.671 ms
  10        60     8.49 MB/sec  warmup   3 sec  latency 333.105 ms
  10        77     8.60 MB/sec  warmup   4 sec  latency 241.249 ms
  10        90     8.09 MB/sec  warmup   5 sec  latency 312.021 ms
  10       104     7.94 MB/sec  warmup   6 sec  latency 527.311 ms
  10       115     7.54 MB/sec  warmup   7 sec  latency 645.990 ms
  10       130     7.20 MB/sec  warmup   8 sec  latency 669.669 ms
  10       155     7.20 MB/sec  warmup   9 sec  latency 226.276 ms
  10       173     7.01 MB/sec  warmup  10 sec  latency 239.231 ms
  10       191     6.94 MB/sec  warmup  11 sec  latency 476.108 ms
  10       210     6.84 MB/sec  warmup  12 sec  latency 513.792 ms
  10       228     6.74 MB/sec  warmup  13 sec  latency 352.793 ms
  10       240     6.54 MB/sec  warmup  14 sec  latency 533.419 ms
  10       261     6.56 MB/sec  warmup  15 sec  latency 314.792 ms
  10       276     6.45 MB/sec  warmup  16 sec  latency 347.914 ms
  10       296     6.42 MB/sec  warmup  17 sec  latency 505.699 ms
  10       312     6.34 MB/sec  warmup  18 sec  latency 358.329 ms
[313] open ./clients/client4/~dmtmp/PM failed for handle 9972 (Unknown error 526)
(314) ERROR: handle 9972 was not found
Child failed with status 1