== sanity test 101b: check stride-io mode read-ahead =========================================================================== 01:03:55 (1788843835)
striped dir -i1 -c2 -H all_char  /mnt/lustre/d101b.sanity

2.098269s, 3.99787MB/s
Read-ahead success for size 8192

1.918943s, 4.37147MB/s
Read-ahead success for size 16384

2.187792s, 3.83428MB/s
Read-ahead success for size 32768

1.877882s, 4.46706MB/s
Read-ahead success for size 65536

1.550360s, 5.41075MB/s
Read-ahead success for size 131072

1.383720s, 6.06236MB/s
Read-ahead success for size 262144

1.619555s, 5.17958MB/s
Read-ahead success for size 524288

1.096592s, 7.64971MB/s
Read-ahead success for size 1048576