== sanity test 101b: check stride-io mode read-ahead =========================================================================== 10:02:33 (1786802553)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.519726s, 5.51982MB/s
Read-ahead success for size 8192

1.892959s, 4.43148MB/s
Read-ahead success for size 16384

1.972388s, 4.25302MB/s
Read-ahead success for size 32768

2.113089s, 3.96983MB/s
Read-ahead success for size 65536

1.511910s, 5.54835MB/s
Read-ahead success for size 131072

1.526112s, 5.49672MB/s
Read-ahead success for size 262144

1.016342s, 8.25373MB/s
Read-ahead success for size 524288

1.209481s, 6.93571MB/s
Read-ahead success for size 1048576