== sanity test 101b: check stride-io mode read-ahead =========================================================================== 07:24:23 (1789125863)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.147853s, 7.30809MB/s
Read-ahead success for size 8192

1.431277s, 5.86093MB/s
Read-ahead success for size 16384

1.603640s, 5.23098MB/s
Read-ahead success for size 32768

1.850652s, 4.53279MB/s
Read-ahead success for size 65536

1.440961s, 5.82154MB/s
Read-ahead success for size 131072

1.297743s, 6.464MB/s
Read-ahead success for size 262144

1.211647s, 6.92331MB/s
Read-ahead success for size 524288

0.949226s, 8.83731MB/s
Read-ahead success for size 1048576