== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:10:48 (1787389848)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.612790s, 5.2013MB/s
Read-ahead success for size 8192

1.484656s, 5.6502MB/s
Read-ahead success for size 16384

1.538476s, 5.45254MB/s
Read-ahead success for size 32768

1.667494s, 5.03067MB/s
Read-ahead success for size 65536

1.227015s, 6.8366MB/s
Read-ahead success for size 131072

1.269281s, 6.60894MB/s
Read-ahead success for size 262144

1.162989s, 7.21297MB/s
Read-ahead success for size 524288

1.004765s, 8.34883MB/s
Read-ahead success for size 1048576