== sanity test 101b: check stride-io mode read-ahead =========================================================================== 17:27:42 (1789075662)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.873889s, 4.47658MB/s
Read-ahead success for size 8192

2.155947s, 3.89092MB/s
Read-ahead success for size 16384

2.822987s, 2.97154MB/s
Read-ahead success for size 32768

2.603045s, 3.22261MB/s
Read-ahead success for size 65536

1.539267s, 5.44974MB/s
Read-ahead success for size 131072

1.507862s, 5.56325MB/s
Read-ahead success for size 262144

1.594067s, 5.26239MB/s
Read-ahead success for size 524288

1.550318s, 5.4109MB/s
Read-ahead success for size 1048576