== sanity test 101b: check stride-io mode read-ahead =========================================================================== 07:13:01 (1787829181)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.013010s, 4.1672MB/s
Read-ahead success for size 8192

2.076720s, 4.03935MB/s
Read-ahead success for size 16384

2.356363s, 3.55998MB/s
Read-ahead success for size 32768

1.560572s, 5.37534MB/s
Read-ahead success for size 65536

1.583600s, 5.29718MB/s
Read-ahead success for size 131072

1.253513s, 6.69208MB/s
Read-ahead success for size 262144

1.197069s, 7.00762MB/s
Read-ahead success for size 524288

1.268933s, 6.61076MB/s
Read-ahead success for size 1048576