== sanity test 101b: check stride-io mode read-ahead =========================================================================== 20:00:16 (1781222416)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.699837s, 4.93495MB/s
Read-ahead success for size 8192

2.009415s, 4.17465MB/s
Read-ahead success for size 16384

2.194411s, 3.82272MB/s
Read-ahead success for size 32768

1.832679s, 4.57724MB/s
Read-ahead success for size 65536

1.567077s, 5.35303MB/s
Read-ahead success for size 131072

1.715263s, 4.89057MB/s
Read-ahead success for size 262144

1.448889s, 5.78968MB/s
Read-ahead success for size 524288

1.684769s, 4.97908MB/s
Read-ahead success for size 1048576