== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:04:44 (1746072284)
striped dir -i1 -c2 -H crush /mnt/lustre/d101b.sanity

0.720573s, 11.6416MB/s
Read-ahead success for size 8192

0.688942s, 12.1761MB/s
Read-ahead success for size 16384

0.664811s, 12.618MB/s
Read-ahead success for size 32768

0.600136s, 13.9778MB/s
Read-ahead success for size 65536

0.539518s, 15.5483MB/s
Read-ahead success for size 131072

0.481581s, 17.4189MB/s
Read-ahead success for size 262144

0.437470s, 19.1753MB/s
Read-ahead success for size 524288

0.385254s, 21.7742MB/s
Read-ahead success for size 1048576