== sanity test 101b: check stride-io mode read-ahead =========================================================================== 22:55:04 (1789268104)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

2.374216s, 3.53321MB/s
Read-ahead success for size 8192

1.660993s, 5.05036MB/s
Read-ahead success for size 16384

1.998035s, 4.19843MB/s
Read-ahead success for size 32768

1.991222s, 4.21279MB/s
Read-ahead success for size 65536

1.961428s, 4.27679MB/s
Read-ahead success for size 131072

1.850573s, 4.53298MB/s
Read-ahead success for size 262144

1.205102s, 6.96091MB/s
Read-ahead success for size 524288

1.317808s, 6.36558MB/s
Read-ahead success for size 1048576