== sanity test 101b: check stride-io mode read-ahead =========================================================================== 09:22:08 (1789132928)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.333387s, 3.59504MB/s
Read-ahead success for size 8192

1.895731s, 4.425MB/s
Read-ahead success for size 16384

2.398000s, 3.49817MB/s
Read-ahead success for size 32768

2.602252s, 3.2236MB/s
Read-ahead success for size 65536

2.583271s, 3.24728MB/s
Read-ahead success for size 131072

1.987413s, 4.22087MB/s
Read-ahead success for size 262144

1.280367s, 6.55172MB/s
Read-ahead success for size 524288

1.420867s, 5.90387MB/s
Read-ahead success for size 1048576