== sanity test 101b: check stride-io mode read-ahead =========================================================================== 03:18:59 (1753427939)
striped dir -i1 -c2 -H crush /mnt/lustre/d101b.sanity

0.592961s, 14.147MB/s
Read-ahead success for size 8192

0.514666s, 16.2991MB/s
Read-ahead success for size 16384

0.560089s, 14.9773MB/s
Read-ahead success for size 32768

0.524631s, 15.9895MB/s
Read-ahead success for size 65536

0.538599s, 15.5749MB/s
Read-ahead success for size 131072

0.515418s, 16.2753MB/s
Read-ahead success for size 262144

0.472954s, 17.7366MB/s
Read-ahead success for size 524288

0.481565s, 17.4195MB/s
Read-ahead success for size 1048576