== sanity test 101b: check stride-io mode read-ahead =========================================================================== 01:24:57 (1788845097)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.677053s, 5.00199MB/s
Read-ahead success for size 8192

1.534155s, 5.4679MB/s
Read-ahead success for size 16384

1.569678s, 5.34416MB/s
Read-ahead success for size 32768

1.238393s, 6.77379MB/s
Read-ahead success for size 65536

1.489642s, 5.63129MB/s
Read-ahead success for size 131072

1.247323s, 6.72529MB/s
Read-ahead success for size 262144

1.278330s, 6.56216MB/s
Read-ahead success for size 524288

1.308647s, 6.41014MB/s
Read-ahead success for size 1048576