== sanity test 101b: check stride-io mode read-ahead =========================================================================== 04:40:40 (1788511240)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.976709s, 4.24372MB/s
Read-ahead success for size 8192

1.538762s, 5.45153MB/s
Read-ahead success for size 16384

1.901645s, 4.41124MB/s
Read-ahead success for size 32768

1.623557s, 5.16681MB/s
Read-ahead success for size 65536

1.314781s, 6.38023MB/s
Read-ahead success for size 131072

1.152632s, 7.27779MB/s
Read-ahead success for size 262144

1.268133s, 6.61493MB/s
Read-ahead success for size 524288

1.209940s, 6.93308MB/s
Read-ahead success for size 1048576