== sanity test 101b: check stride-io mode read-ahead =========================================================================== 19:57:06 (1787615826)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.462457s, 5.73597MB/s
Read-ahead success for size 8192

1.802765s, 4.65319MB/s
Read-ahead success for size 16384

1.714655s, 4.8923MB/s
Read-ahead success for size 32768

1.584131s, 5.2954MB/s
Read-ahead success for size 65536

1.581340s, 5.30475MB/s
Read-ahead success for size 131072

1.995976s, 4.20276MB/s
Read-ahead success for size 262144

1.605392s, 5.22527MB/s
Read-ahead success for size 524288

1.263552s, 6.63891MB/s
Read-ahead success for size 1048576