== sanity test 101b: check stride-io mode read-ahead =========================================================================== 22:22:37 (1789352557)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

0.865653s, 9.6905MB/s
Read-ahead success for size 8192

0.911615s, 9.20192MB/s
Read-ahead success for size 16384

1.038500s, 8.07762MB/s
Read-ahead success for size 32768

0.955522s, 8.77908MB/s
Read-ahead success for size 65536

0.804248s, 10.4304MB/s
Read-ahead success for size 131072

0.785361s, 10.6812MB/s
Read-ahead success for size 262144

0.756561s, 11.0878MB/s
Read-ahead success for size 524288

0.804806s, 10.4231MB/s
Read-ahead success for size 1048576