== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:01:30 (1713430890)
striped dir -i1 -c2 -H crush /mnt/lustre/d101b.sanity

5.073323s, 1.65347MB/s
Read-ahead success for size 8192

4.266932s, 1.96596MB/s
Read-ahead success for size 16384

4.120478s, 2.03583MB/s
Read-ahead success for size 32768

3.889155s, 2.15692MB/s
Read-ahead success for size 65536

3.816593s, 2.19793MB/s
Read-ahead success for size 131072

3.825818s, 2.19263MB/s
Read-ahead success for size 262144

4.020920s, 2.08624MB/s
Read-ahead success for size 524288

3.718473s, 2.25593MB/s
Read-ahead success for size 1048576