== sanity test 101b: check stride-io mode read-ahead =========================================================================== 14:29:25 (1788200965)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.655794s, 5.06621MB/s
Read-ahead success for size 8192

1.314671s, 6.38077MB/s
Read-ahead success for size 16384

2.413407s, 3.47584MB/s
Read-ahead success for size 32768

1.901926s, 4.41059MB/s
Read-ahead success for size 65536

1.653185s, 5.07421MB/s
Read-ahead success for size 131072

1.361904s, 6.15947MB/s
Read-ahead success for size 262144

0.984809s, 8.51801MB/s
Read-ahead success for size 524288

1.045771s, 8.02146MB/s
Read-ahead success for size 1048576