== sanity test 101b: check stride-io mode read-ahead =========================================================================== 10:48:43 (1713365323)
striped dir -i1 -c2 -H crush /mnt/lustre/d101b.sanity

4.533018s, 1.85056MB/s
Read-ahead success for size 8192

4.489688s, 1.86842MB/s
Read-ahead success for size 16384

4.591092s, 1.82715MB/s
Read-ahead success for size 32768

5.855278s, 1.43266MB/s
Read-ahead success for size 65536

3.785333s, 2.21608MB/s
Read-ahead success for size 131072

3.747812s, 2.23827MB/s
Read-ahead success for size 262144

3.637628s, 2.30607MB/s
Read-ahead success for size 524288

3.368074s, 2.49062MB/s
Read-ahead success for size 1048576