== sanity test 101b: check stride-io mode read-ahead =========================================================================== 15:24:38 (1789673078)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.478212s, 5.67483MB/s
Read-ahead success for size 8192

1.734095s, 4.83746MB/s
Read-ahead success for size 16384

1.845150s, 4.5463MB/s
Read-ahead success for size 32768

1.853163s, 4.52664MB/s
Read-ahead success for size 65536

1.652447s, 5.07648MB/s
Read-ahead success for size 131072

1.425346s, 5.88531MB/s
Read-ahead success for size 262144

1.487726s, 5.63854MB/s
Read-ahead success for size 524288

1.250295s, 6.7093MB/s
Read-ahead success for size 1048576