== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:43:30 (1712137410)
striped dir -i1 -c2 -H crush2 /mnt/lustre/d101b.sanity

4.559736s, 1.83971MB/s
Read-ahead success for size 8192

3.963288s, 2.11658MB/s
Read-ahead success for size 16384

3.709946s, 2.26111MB/s
Read-ahead success for size 32768

3.918887s, 2.14056MB/s
Read-ahead success for size 65536

3.699141s, 2.26772MB/s
Read-ahead success for size 131072

3.668818s, 2.28646MB/s
Read-ahead success for size 262144

3.676730s, 2.28154MB/s
Read-ahead success for size 524288

3.064430s, 2.73741MB/s
Read-ahead success for size 1048576