== sanity test 101b: check stride-io mode read-ahead =========================================================================== 12:36:19 (1786034179)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.516908s, 5.53007MB/s
Read-ahead success for size 8192

2.948652s, 2.8449MB/s
Read-ahead success for size 16384

2.897971s, 2.89465MB/s
Read-ahead success for size 32768

2.562816s, 3.2732MB/s
Read-ahead success for size 65536

2.228140s, 3.76485MB/s
Read-ahead success for size 131072

2.125679s, 3.94632MB/s
Read-ahead success for size 262144

1.600087s, 5.24259MB/s
Read-ahead success for size 524288

1.579831s, 5.30981MB/s
Read-ahead success for size 1048576