== sanity test 101b: check stride-io mode read-ahead =========================================================================== 04:44:51 (1788511491)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.604658s, 5.22766MB/s
Read-ahead success for size 8192

1.520899s, 5.51556MB/s
Read-ahead success for size 16384

1.786080s, 4.69666MB/s
Read-ahead success for size 32768

1.327008s, 6.32144MB/s
Read-ahead success for size 65536

1.520883s, 5.51562MB/s
Read-ahead success for size 131072

1.298785s, 6.45881MB/s
Read-ahead success for size 262144

1.362325s, 6.15757MB/s
Read-ahead success for size 524288

1.267168s, 6.61997MB/s
Read-ahead success for size 1048576