== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:11:23 (1787908283)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.868374s, 4.48979MB/s
Read-ahead success for size 8192

1.766463s, 4.74882MB/s
Read-ahead success for size 16384

1.662207s, 5.04667MB/s
Read-ahead success for size 32768

1.549317s, 5.41439MB/s
Read-ahead success for size 65536

1.721546s, 4.87272MB/s
Read-ahead success for size 131072

1.271303s, 6.59843MB/s
Read-ahead success for size 262144

1.351383s, 6.20742MB/s
Read-ahead success for size 524288

1.351305s, 6.20778MB/s
Read-ahead success for size 1048576