== sanity test 101b: check stride-io mode read-ahead =========================================================================== 11:23:33 (1786029813)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.548049s, 5.41883MB/s
Read-ahead success for size 8192

1.897427s, 4.42104MB/s
Read-ahead success for size 16384

1.770172s, 4.73887MB/s
Read-ahead success for size 32768

2.220228s, 3.77826MB/s
Read-ahead success for size 65536

1.853140s, 4.5267MB/s
Read-ahead success for size 131072

1.110274s, 7.55544MB/s
Read-ahead success for size 262144

1.102661s, 7.6076MB/s
Read-ahead success for size 524288

1.187628s, 7.06333MB/s
Read-ahead success for size 1048576