== sanity test 101b: check stride-io mode read-ahead =========================================================================== 19:47:01 (1788565621)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.847923s, 4.53948MB/s
Read-ahead success for size 8192

1.318343s, 6.36299MB/s
Read-ahead success for size 16384

1.122959s, 7.47009MB/s
Read-ahead success for size 32768

1.394051s, 6.01743MB/s
Read-ahead success for size 65536

1.229785s, 6.8212MB/s
Read-ahead success for size 131072

0.774717s, 10.828MB/s
Read-ahead success for size 262144

0.642008s, 13.0662MB/s
Read-ahead success for size 524288

1.143487s, 7.33599MB/s
Read-ahead success for size 1048576