== sanity test 101b: check stride-io mode read-ahead =========================================================================== 23:36:08 (1788838568)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.648676s, 5.08809MB/s
Read-ahead success for size 8192

1.328274s, 6.31542MB/s
Read-ahead success for size 16384

1.665063s, 5.03801MB/s
Read-ahead success for size 32768

1.416028s, 5.92404MB/s
Read-ahead success for size 65536

1.437022s, 5.83749MB/s
Read-ahead success for size 131072

1.317853s, 6.36536MB/s
Read-ahead success for size 262144

1.154999s, 7.26287MB/s
Read-ahead success for size 524288

0.991671s, 8.45906MB/s
Read-ahead success for size 1048576