== sanity test 101b: check stride-io mode read-ahead =========================================================================== 23:19:10 (1764735550)
striped dir -i1 -c2 -H crush2 /mnt/lustre/d101b.sanity

1.452825s, 5.774MB/s
Read-ahead success for size 8192

1.406125s, 5.96576MB/s
Read-ahead success for size 16384

1.200734s, 6.98623MB/s
Read-ahead success for size 32768

1.147748s, 7.30875MB/s
Read-ahead success for size 65536

1.045147s, 8.02625MB/s
Read-ahead success for size 131072

0.918977s, 9.1282MB/s
Read-ahead success for size 262144

0.950163s, 8.8286MB/s
Read-ahead success for size 524288

0.795772s, 10.5415MB/s
Read-ahead success for size 1048576