== sanity test 101b: check stride-io mode read-ahead =========================================================================== 02:07:55 (1776924475)
striped dir -i1 -c2 -H crush2 /mnt/lustre/d101b.sanity

2.645613s, 3.17076MB/s
Read-ahead success for size 8192

2.847808s, 2.94564MB/s
Read-ahead success for size 16384

2.767255s, 3.03138MB/s
Read-ahead success for size 32768

2.039681s, 4.11271MB/s
Read-ahead success for size 65536

2.654034s, 3.1607MB/s
Read-ahead success for size 131072

2.400321s, 3.49479MB/s
Read-ahead success for size 262144

1.975774s, 4.24573MB/s
Read-ahead success for size 524288

1.969640s, 4.25895MB/s
Read-ahead success for size 1048576