== sanity test 101b: check stride-io mode read-ahead =========================================================================== 21:13:43 (1778289223)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.800261s, 4.65966MB/s
Read-ahead success for size 8192

1.733527s, 4.83904MB/s
Read-ahead success for size 16384

1.718523s, 4.88129MB/s
Read-ahead success for size 32768

1.716854s, 4.88603MB/s
Read-ahead success for size 65536

1.362134s, 6.15843MB/s
Read-ahead success for size 131072

1.685695s, 4.97635MB/s
Read-ahead success for size 262144

1.333189s, 6.29214MB/s
Read-ahead success for size 524288

1.289848s, 6.50356MB/s
Read-ahead success for size 1048576