== sanity test 101b: check stride-io mode read-ahead =========================================================================== 20:01:58 (1784937718)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.259261s, 3.71299MB/s
Read-ahead success for size 8192

2.282248s, 3.67559MB/s
Read-ahead success for size 16384

2.182970s, 3.84275MB/s
Read-ahead success for size 32768

2.152810s, 3.89659MB/s
Read-ahead success for size 65536

1.945792s, 4.31115MB/s
Read-ahead success for size 131072

1.447759s, 5.7942MB/s
Read-ahead success for size 262144

1.824761s, 4.5971MB/s
Read-ahead success for size 524288

1.426880s, 5.87899MB/s
Read-ahead success for size 1048576