== sanity test 101b: check stride-io mode read-ahead =========================================================================== 17:40:02 (1781818802)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.651926s, 5.07808MB/s
Read-ahead success for size 8192

1.914984s, 4.38051MB/s
Read-ahead success for size 16384

2.566675s, 3.26828MB/s
Read-ahead success for size 32768

1.866696s, 4.49383MB/s
Read-ahead success for size 65536

1.356972s, 6.18186MB/s
Read-ahead success for size 131072

1.399587s, 5.99363MB/s
Read-ahead success for size 262144

1.206792s, 6.95116MB/s
Read-ahead success for size 524288

1.011812s, 8.29068MB/s
Read-ahead success for size 1048576