== sanity test 101b: check stride-io mode read-ahead =========================================================================== 03:47:16 (1779695236)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.830980s, 4.58149MB/s
Read-ahead success for size 8192

2.074448s, 4.04378MB/s
Read-ahead success for size 16384

1.811822s, 4.62993MB/s
Read-ahead success for size 32768

1.778561s, 4.71651MB/s
Read-ahead success for size 65536

1.628244s, 5.15194MB/s
Read-ahead success for size 131072

1.365639s, 6.14262MB/s
Read-ahead success for size 262144

1.224899s, 6.84841MB/s
Read-ahead success for size 524288

1.383337s, 6.06404MB/s
Read-ahead success for size 1048576