== sanity test 101b: check stride-io mode read-ahead =========================================================================== 01:03:58 (1786943038)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.375876s, 6.09692MB/s
Read-ahead success for size 8192

1.555693s, 5.3922MB/s
Read-ahead success for size 16384

1.650587s, 5.0822MB/s
Read-ahead success for size 32768

1.587910s, 5.2828MB/s
Read-ahead success for size 65536

1.664557s, 5.03954MB/s
Read-ahead success for size 131072

1.339221s, 6.2638MB/s
Read-ahead success for size 262144

1.497154s, 5.60304MB/s
Read-ahead success for size 524288

1.419148s, 5.91102MB/s
Read-ahead success for size 1048576