== sanity test 101b: check stride-io mode read-ahead =========================================================================== 23:12:13 (1786417933)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.581464s, 5.30433MB/s
Read-ahead success for size 8192

1.706307s, 4.91624MB/s
Read-ahead success for size 16384

1.968247s, 4.26197MB/s
Read-ahead success for size 32768

1.966190s, 4.26643MB/s
Read-ahead success for size 65536

1.621971s, 5.17186MB/s
Read-ahead success for size 131072

1.480290s, 5.66687MB/s
Read-ahead success for size 262144

0.980347s, 8.55677MB/s
Read-ahead success for size 524288

0.902142s, 9.29855MB/s
Read-ahead success for size 1048576