== sanity test 101b: check stride-io mode read-ahead =========================================================================== 01:31:05 (1788931865)
striped dir -i1 -c2 -H all_char  /mnt/lustre/d101b.sanity

1.916935s, 4.37605MB/s
Read-ahead success for size 8192

2.001399s, 4.19137MB/s
Read-ahead success for size 16384

2.529419s, 3.31642MB/s
Read-ahead success for size 32768

2.068843s, 4.05473MB/s
Read-ahead success for size 65536

1.608455s, 5.21532MB/s
Read-ahead success for size 131072

1.623810s, 5.166MB/s
Read-ahead success for size 262144

1.263731s, 6.63797MB/s
Read-ahead success for size 524288

1.418591s, 5.91334MB/s
Read-ahead success for size 1048576