== sanity test 101b: check stride-io mode read-ahead =========================================================================== 03:55:42 (1788508542)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.744765s, 4.80787MB/s
Read-ahead success for size 8192

1.632231s, 5.13935MB/s
Read-ahead success for size 16384

2.182503s, 3.84357MB/s
Read-ahead success for size 32768

1.634192s, 5.13318MB/s
Read-ahead success for size 65536

1.641232s, 5.11117MB/s
Read-ahead success for size 131072

1.620103s, 5.17782MB/s
Read-ahead success for size 262144

1.331019s, 6.3024MB/s
Read-ahead success for size 524288

1.429944s, 5.86639MB/s
Read-ahead success for size 1048576