== sanity test 101b: check stride-io mode read-ahead =========================================================================== 10:11:20 (1788531080)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.830199s, 4.58344MB/s
Read-ahead success for size 8192

1.818478s, 4.61298MB/s
Read-ahead success for size 16384

1.932864s, 4.33999MB/s
Read-ahead success for size 32768

1.951966s, 4.29752MB/s
Read-ahead success for size 65536

1.800993s, 4.65777MB/s
Read-ahead success for size 131072

1.610410s, 5.20899MB/s
Read-ahead success for size 262144

1.498012s, 5.59983MB/s
Read-ahead success for size 524288

1.345951s, 6.23248MB/s
Read-ahead success for size 1048576