== sanity test 101b: check stride-io mode read-ahead =========================================================================== 20:59:39 (1789779579)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.619976s, 5.17823MB/s
Read-ahead success for size 8192

1.882649s, 4.45575MB/s
Read-ahead success for size 16384

1.868265s, 4.49005MB/s
Read-ahead success for size 32768

1.566241s, 5.35589MB/s
Read-ahead success for size 65536

1.403379s, 5.97744MB/s
Read-ahead success for size 131072

1.401645s, 5.98483MB/s
Read-ahead success for size 262144

1.157083s, 7.24979MB/s
Read-ahead success for size 524288

1.240465s, 6.76247MB/s
Read-ahead success for size 1048576