== sanity test 101b: check stride-io mode read-ahead =========================================================================== 16:15:25 (1786565725)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.791709s, 4.6819MB/s
Read-ahead success for size 8192

1.903853s, 4.40612MB/s
Read-ahead success for size 16384

2.024947s, 4.14263MB/s
Read-ahead success for size 32768

1.998939s, 4.19653MB/s
Read-ahead success for size 65536

1.633785s, 5.13446MB/s
Read-ahead success for size 131072

1.133174s, 7.40275MB/s
Read-ahead success for size 262144

1.427732s, 5.87548MB/s
Read-ahead success for size 524288

1.232939s, 6.80375MB/s
Read-ahead success for size 1048576