== sanity test 101b: check stride-io mode read-ahead =========================================================================== 01:40:40 (1789018840)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.933008s, 4.33967MB/s
Read-ahead success for size 8192

1.444422s, 5.80759MB/s
Read-ahead success for size 16384

1.584310s, 5.2948MB/s
Read-ahead success for size 32768

1.883117s, 4.45464MB/s
Read-ahead success for size 65536

2.078728s, 4.03545MB/s
Read-ahead success for size 131072

1.462921s, 5.73415MB/s
Read-ahead success for size 262144

1.405245s, 5.9695MB/s
Read-ahead success for size 524288

1.290781s, 6.49886MB/s
Read-ahead success for size 1048576