== sanity test 101b: check stride-io mode read-ahead =========================================================================== 04:54:55 (1789289695)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.668750s, 5.02688MB/s
Read-ahead success for size 8192

2.028256s, 4.13587MB/s
Read-ahead success for size 16384

2.097967s, 3.99845MB/s
Read-ahead success for size 32768

1.718819s, 4.88045MB/s
Read-ahead success for size 65536

1.711322s, 4.90183MB/s
Read-ahead success for size 131072

1.607448s, 5.21859MB/s
Read-ahead success for size 262144

1.281523s, 6.54581MB/s
Read-ahead success for size 524288

1.212542s, 6.9182MB/s
Read-ahead success for size 1048576