== sanity test 101b: check stride-io mode read-ahead =========================================================================== 12:16:22 (1788624982)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.628681s, 5.15055MB/s
Read-ahead success for size 8192

1.532727s, 5.473MB/s
Read-ahead success for size 16384

1.755371s, 4.77882MB/s
Read-ahead success for size 32768

1.980709s, 4.23515MB/s
Read-ahead success for size 65536

1.630763s, 5.14398MB/s
Read-ahead success for size 131072

1.685364s, 4.97733MB/s
Read-ahead success for size 262144

1.403028s, 5.97893MB/s
Read-ahead success for size 524288

1.318690s, 6.36132MB/s
Read-ahead success for size 1048576