== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:26:52 (1787822812)
striped dir -i1 -c2 -H all_char  /mnt/lustre/d101b.sanity

2.356216s, 3.5602MB/s
Read-ahead success for size 8192

2.163501s, 3.87733MB/s
Read-ahead success for size 16384

2.270277s, 3.69497MB/s
Read-ahead success for size 32768

1.729934s, 4.84909MB/s
Read-ahead success for size 65536

2.385922s, 3.51588MB/s
Read-ahead success for size 131072

1.724519s, 4.86432MB/s
Read-ahead success for size 262144

0.928819s, 9.03148MB/s
Read-ahead success for size 524288

0.771786s, 10.8691MB/s
Read-ahead success for size 1048576