== sanity test 101b: check stride-io mode read-ahead =========================================================================== 22:34:53 (1788834893)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.754366s, 4.78156MB/s
Read-ahead success for size 8192

1.741621s, 4.81655MB/s
Read-ahead success for size 16384

1.927338s, 4.35243MB/s
Read-ahead success for size 32768

1.839942s, 4.55917MB/s
Read-ahead success for size 65536

1.952556s, 4.29622MB/s
Read-ahead success for size 131072

1.477743s, 5.67664MB/s
Read-ahead success for size 262144

1.482001s, 5.66033MB/s
Read-ahead success for size 524288

1.607403s, 5.21873MB/s
Read-ahead success for size 1048576