== sanity test 101b: check stride-io mode read-ahead =========================================================================== 10:02:15 (1782482535)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

0.872687s, 9.61239MB/s
Read-ahead success for size 8192

0.854579s, 9.81607MB/s
Read-ahead success for size 16384

1.008083s, 8.32135MB/s
Read-ahead success for size 32768

0.909330s, 9.22504MB/s
Read-ahead success for size 65536

0.825598s, 10.1606MB/s
Read-ahead success for size 131072

0.656861s, 12.7708MB/s
Read-ahead success for size 262144

0.622745s, 13.4704MB/s
Read-ahead success for size 524288

0.559487s, 14.9934MB/s
Read-ahead success for size 1048576