== sanity test 101b: check stride-io mode read-ahead =========================================================================== 12:58:37 (1780333117)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.834111s, 4.57366MB/s
Read-ahead success for size 8192

1.703022s, 4.92572MB/s
Read-ahead success for size 16384

1.829494s, 4.58521MB/s
Read-ahead success for size 32768

1.772766s, 4.73193MB/s
Read-ahead success for size 65536

1.581766s, 5.30332MB/s
Read-ahead success for size 131072

1.577034s, 5.31923MB/s
Read-ahead success for size 262144

1.402500s, 5.98118MB/s
Read-ahead success for size 524288

1.070786s, 7.83407MB/s
Read-ahead success for size 1048576