== sanity test 101b: check stride-io mode read-ahead =========================================================================== 02:55:23 (1785221723)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.015192s, 8.26308MB/s
Read-ahead success for size 8192

0.952416s, 8.80771MB/s
Read-ahead success for size 16384

1.162910s, 7.21346MB/s
Read-ahead success for size 32768

1.106058s, 7.58424MB/s
Read-ahead success for size 65536

0.928383s, 9.03572MB/s
Read-ahead success for size 131072

0.861274s, 9.73977MB/s
Read-ahead success for size 262144

0.782661s, 10.7181MB/s
Read-ahead success for size 524288

0.687258s, 12.2059MB/s
Read-ahead success for size 1048576