== sanity test 101b: check stride-io mode read-ahead =========================================================================== 08:59:58 (1788353998)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

0.523630s, 16.0201MB/s
Read-ahead success for size 8192

0.578591s, 14.4983MB/s
Read-ahead success for size 16384

0.596153s, 14.0712MB/s
Read-ahead success for size 32768

0.580715s, 14.4453MB/s
Read-ahead success for size 65536

0.543083s, 15.4463MB/s
Read-ahead success for size 131072

0.481359s, 17.4269MB/s
Read-ahead success for size 262144

0.421194s, 19.9163MB/s
Read-ahead success for size 524288

0.461537s, 18.1754MB/s
Read-ahead success for size 1048576