== sanity test 101b: check stride-io mode read-ahead =========================================================================== 10:47:40 (1790002060)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.158166s, 7.24301MB/s
Read-ahead success for size 8192

1.473959s, 5.69121MB/s
Read-ahead success for size 16384

1.882307s, 4.45656MB/s
Read-ahead success for size 32768

1.589922s, 5.27611MB/s
Read-ahead success for size 65536

1.644697s, 5.1004MB/s
Read-ahead success for size 131072

1.596945s, 5.25291MB/s
Read-ahead success for size 262144

1.102673s, 7.60752MB/s
Read-ahead success for size 524288

1.385008s, 6.05672MB/s
Read-ahead success for size 1048576