== sanity test 101b: check stride-io mode read-ahead =========================================================================== 15:06:10 (1786734370)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.949220s, 4.30357MB/s
Read-ahead success for size 8192

1.600211s, 5.24219MB/s
Read-ahead success for size 16384

1.766901s, 4.74764MB/s
Read-ahead success for size 32768

1.851892s, 4.52975MB/s
Read-ahead success for size 65536

1.585646s, 5.29034MB/s
Read-ahead success for size 131072

1.346776s, 6.22866MB/s
Read-ahead success for size 262144

1.318343s, 6.36299MB/s
Read-ahead success for size 524288

1.427894s, 5.87481MB/s
Read-ahead success for size 1048576