== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:32:00 (1782361920)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

0.542829s, 15.4535MB/s
Read-ahead success for size 8192

0.565333s, 14.8383MB/s
Read-ahead success for size 16384

0.628723s, 13.3423MB/s
Read-ahead success for size 32768

0.591808s, 14.1745MB/s
Read-ahead success for size 65536

0.475687s, 17.6347MB/s
Read-ahead success for size 131072

0.454718s, 18.4479MB/s
Read-ahead success for size 262144

0.408956s, 20.5123MB/s
Read-ahead success for size 524288

0.456550s, 18.3739MB/s
Read-ahead success for size 1048576