== sanity test 101b: check stride-io mode read-ahead =========================================================================== 02:32:48 (1733643168)
striped dir -i1 -c2 -H crush /mnt/lustre/d101b.sanity

4.315917s, 1.94364MB/s
Read-ahead success for size 8192

4.148419s, 2.02212MB/s
Read-ahead success for size 16384

3.749250s, 2.23741MB/s
Read-ahead success for size 32768

3.828530s, 2.19108MB/s
Read-ahead success for size 65536

3.817651s, 2.19732MB/s
Read-ahead success for size 131072

3.695647s, 2.26986MB/s
Read-ahead success for size 262144

3.747495s, 2.23846MB/s
Read-ahead success for size 524288

3.386486s, 2.47708MB/s
Read-ahead success for size 1048576