== sanity test 101b: check stride-io mode read-ahead =========================================================================== 01:28:23 (1789450103)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.690365s, 4.9626MB/s
Read-ahead success for size 8192

1.635097s, 5.13034MB/s
Read-ahead success for size 16384

2.005005s, 4.18383MB/s
Read-ahead success for size 32768

2.316628s, 3.62104MB/s
Read-ahead success for size 65536

1.949322s, 4.30335MB/s
Read-ahead success for size 131072

1.478386s, 5.67417MB/s
Read-ahead success for size 262144

1.229631s, 6.82205MB/s
Read-ahead success for size 524288

1.308364s, 6.41152MB/s
Read-ahead success for size 1048576