== sanity test 101b: check stride-io mode read-ahead =========================================================================== 14:27:45 (1779992865)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.719997s, 3.08405MB/s
Read-ahead success for size 8192

2.375151s, 3.53182MB/s
Read-ahead success for size 16384

2.294206s, 3.65643MB/s
Read-ahead success for size 32768

1.948688s, 4.30475MB/s
Read-ahead success for size 65536

2.249505s, 3.72909MB/s
Read-ahead success for size 131072

1.866907s, 4.49332MB/s
Read-ahead success for size 262144

1.639704s, 5.11593MB/s
Read-ahead success for size 524288

1.494413s, 5.61331MB/s
Read-ahead success for size 1048576