== sanity test 101b: check stride-io mode read-ahead =========================================================================== 01:03:27 (1788930207)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.133926s, 3.93107MB/s
Read-ahead success for size 8192

2.136128s, 3.92702MB/s
Read-ahead success for size 16384

2.366455s, 3.5448MB/s
Read-ahead success for size 32768

1.745225s, 4.80661MB/s
Read-ahead success for size 65536

1.558906s, 5.38109MB/s
Read-ahead success for size 131072

1.428476s, 5.87242MB/s
Read-ahead success for size 262144

1.510666s, 5.55292MB/s
Read-ahead success for size 524288

1.533329s, 5.47085MB/s
Read-ahead success for size 1048576