== sanity test 101b: check stride-io mode read-ahead =========================================================================== 22:26:42 (1776997602)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.526138s, 5.49662MB/s
Read-ahead success for size 8192

1.630110s, 5.14604MB/s
Read-ahead success for size 16384

2.282679s, 3.6749MB/s
Read-ahead success for size 32768

2.158538s, 3.88625MB/s
Read-ahead success for size 65536

1.709445s, 4.90721MB/s
Read-ahead success for size 131072

1.699113s, 4.93705MB/s
Read-ahead success for size 262144

1.649700s, 5.08493MB/s
Read-ahead success for size 524288

1.509819s, 5.55604MB/s
Read-ahead success for size 1048576