== sanity test 101b: check stride-io mode read-ahead =========================================================================== 06:31:11 (1733398271)
striped dir -i1 -c2 -H crush /mnt/lustre/d101b.sanity

4.411091s, 1.90171MB/s
Read-ahead success for size 8192

4.768423s, 1.7592MB/s
Read-ahead success for size 16384

4.015832s, 2.08888MB/s
Read-ahead success for size 32768

3.820992s, 2.1954MB/s
Read-ahead success for size 65536

4.038454s, 2.07718MB/s
Read-ahead success for size 131072

3.654124s, 2.29565MB/s
Read-ahead success for size 262144

3.673160s, 2.28376MB/s
Read-ahead success for size 524288

3.377177s, 2.48391MB/s
Read-ahead success for size 1048576