== sanity test 101b: check stride-io mode read-ahead =========================================================================== 04:05:48 (1781683548)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

0.481875s, 17.4083MB/s
Read-ahead success for size 8192

0.483829s, 17.338MB/s
Read-ahead success for size 16384

0.561681s, 14.9348MB/s
Read-ahead success for size 32768

0.548853s, 15.2839MB/s
Read-ahead success for size 65536

0.465321s, 18.0276MB/s
Read-ahead success for size 131072

0.429376s, 19.5367MB/s
Read-ahead success for size 262144

0.452517s, 18.5377MB/s
Read-ahead success for size 524288

0.390295s, 21.493MB/s
Read-ahead success for size 1048576