== sanity test 101b: check stride-io mode read-ahead =========================================================================== 07:04:12 (1788865452)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.215585s, 3.78618MB/s
Read-ahead success for size 8192

2.924522s, 2.86837MB/s
Read-ahead success for size 16384

3.264020s, 2.57002MB/s
Read-ahead success for size 32768

2.409419s, 3.48159MB/s
Read-ahead success for size 65536

2.037042s, 4.11803MB/s
Read-ahead success for size 131072

1.576813s, 5.31998MB/s
Read-ahead success for size 262144

1.094233s, 7.6662MB/s
Read-ahead success for size 524288

1.687112s, 4.97217MB/s
Read-ahead success for size 1048576