== sanity test 101b: check stride-io mode read-ahead =========================================================================== 02:57:23 (1789023443)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.837322s, 4.56567MB/s
Read-ahead success for size 8192

1.729688s, 4.84978MB/s
Read-ahead success for size 16384

2.106141s, 3.98293MB/s
Read-ahead success for size 32768

2.340070s, 3.58477MB/s
Read-ahead success for size 65536

1.931261s, 4.34359MB/s
Read-ahead success for size 131072

1.336622s, 6.27598MB/s
Read-ahead success for size 262144

1.304877s, 6.42866MB/s
Read-ahead success for size 524288

1.661285s, 5.04947MB/s
Read-ahead success for size 1048576