== sanity test 101b: check stride-io mode read-ahead =========================================================================== 21:36:01 (1723253761)
striped dir -i1 -c2 -H crush2 /mnt/lustre/d101b.sanity

4.556272s, 1.84111MB/s
Read-ahead success for size 8192

4.156571s, 2.01816MB/s
Read-ahead success for size 16384

4.228200s, 1.98397MB/s
Read-ahead success for size 32768

3.921085s, 2.13936MB/s
Read-ahead success for size 65536

3.733605s, 2.24679MB/s
Read-ahead success for size 131072

3.871194s, 2.16693MB/s
Read-ahead success for size 262144

3.632907s, 2.30906MB/s
Read-ahead success for size 524288

3.726851s, 2.25086MB/s
Read-ahead success for size 1048576