== sanity test 101b: check stride-io mode read-ahead =========================================================================== 09:03:45 (1787576625)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.713524s, 4.89553MB/s
Read-ahead success for size 8192

1.922409s, 4.36359MB/s
Read-ahead success for size 16384

2.406226s, 3.48621MB/s
Read-ahead success for size 32768

1.657413s, 5.06127MB/s
Read-ahead success for size 65536

2.186203s, 3.83707MB/s
Read-ahead success for size 131072

2.065401s, 4.06149MB/s
Read-ahead success for size 262144

1.499865s, 5.59291MB/s
Read-ahead success for size 524288

1.802189s, 4.65468MB/s
Read-ahead success for size 1048576