== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:34:57 (1783139697)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.812876s, 4.62724MB/s
Read-ahead success for size 8192

1.864563s, 4.49897MB/s
Read-ahead success for size 16384

2.159776s, 3.88402MB/s
Read-ahead success for size 32768

1.848962s, 4.53693MB/s
Read-ahead success for size 65536

1.492740s, 5.6196MB/s
Read-ahead success for size 131072

1.655385s, 5.06747MB/s
Read-ahead success for size 262144

1.435732s, 5.84274MB/s
Read-ahead success for size 524288

1.300639s, 6.44961MB/s
Read-ahead success for size 1048576