== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:21:15 (1734430875)
striped dir -i1 -c2 -H crush /mnt/lustre/d101b.sanity

12.932537s, 0.648644MB/s
Read-ahead success for size 8192

12.089127s, 0.693897MB/s
Read-ahead success for size 16384

11.748628s, 0.714007MB/s
Read-ahead success for size 32768

10.611017s, 0.790556MB/s
Read-ahead success for size 65536

11.935172s, 0.702848MB/s
Read-ahead success for size 131072

12.077425s, 0.694569MB/s
Read-ahead success for size 262144

10.648836s, 0.787749MB/s
Read-ahead success for size 524288

10.055065s, 0.834267MB/s
Read-ahead success for size 1048576