== sanity test 101b: check stride-io mode read-ahead =========================================================================== 12:36:42 (1752511002)
striped dir -i1 -c2 -H crush2 /mnt/lustre/d101b.sanity

0.674693s, 12.4332MB/s
Read-ahead success for size 8192

0.640944s, 13.0879MB/s
Read-ahead success for size 16384

0.906661s, 9.2522MB/s
Read-ahead success for size 32768

0.522180s, 16.0646MB/s
Read-ahead success for size 65536

0.486778s, 17.2329MB/s
Read-ahead success for size 131072

0.448312s, 18.7115MB/s
Read-ahead success for size 262144

0.580380s, 14.4536MB/s
Read-ahead success for size 524288

0.530073s, 15.8254MB/s
Read-ahead success for size 1048576