== sanity test 101b: check stride-io mode read-ahead =========================================================================== 03:01:37 (1787468497)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

2.333792s, 3.59441MB/s
Read-ahead success for size 8192

2.282998s, 3.67438MB/s
Read-ahead success for size 16384

2.688488s, 3.1202MB/s
Read-ahead success for size 32768

1.783856s, 4.70251MB/s
Read-ahead success for size 65536

1.132948s, 7.40423MB/s
Read-ahead success for size 131072

1.445533s, 5.80312MB/s
Read-ahead success for size 262144

1.129080s, 7.4296MB/s
Read-ahead success for size 524288

1.801651s, 4.65607MB/s
Read-ahead success for size 1048576