== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:12:46 (1721880766)
striped dir -i1 -c2 -H all_char /mnt/lustre/d101b.sanity

4.332262s, 1.93631MB/s
Read-ahead success for size 8192

4.144209s, 2.02418MB/s
Read-ahead success for size 16384

4.124173s, 2.03401MB/s
Read-ahead success for size 32768

3.740062s, 2.24291MB/s
Read-ahead success for size 65536

3.709770s, 2.26122MB/s
Read-ahead success for size 131072

3.706049s, 2.26349MB/s
Read-ahead success for size 262144

3.543536s, 2.3673MB/s
Read-ahead success for size 524288

3.320624s, 2.52621MB/s
Read-ahead success for size 1048576