== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:26:01 (1788755161)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.728776s, 4.85234MB/s
Read-ahead success for size 8192

1.726797s, 4.8579MB/s
Read-ahead success for size 16384

2.544801s, 3.29637MB/s
Read-ahead success for size 32768

1.806327s, 4.64401MB/s
Read-ahead success for size 65536

1.958646s, 4.28286MB/s
Read-ahead success for size 131072

1.490473s, 5.62815MB/s
Read-ahead success for size 262144

1.440985s, 5.82144MB/s
Read-ahead success for size 524288

1.494380s, 5.61344MB/s
Read-ahead success for size 1048576