== sanity test 101b: check stride-io mode read-ahead =========================================================================== 22:30:54 (1787365854)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.505432s, 5.57223MB/s
Read-ahead success for size 8192

1.911104s, 4.3894MB/s
Read-ahead success for size 16384

1.734419s, 4.83655MB/s
Read-ahead success for size 32768

1.462485s, 5.73586MB/s
Read-ahead success for size 65536

1.282671s, 6.53995MB/s
Read-ahead success for size 131072

1.302520s, 6.44029MB/s
Read-ahead success for size 262144

1.376611s, 6.09367MB/s
Read-ahead success for size 524288

1.633970s, 5.13388MB/s
Read-ahead success for size 1048576