== sanity test 101b: check stride-io mode read-ahead =========================================================================== 00:05:04 (1788840304)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.639470s, 5.11666MB/s
Read-ahead success for size 8192

1.583119s, 5.29879MB/s
Read-ahead success for size 16384

2.021025s, 4.15067MB/s
Read-ahead success for size 32768

1.727672s, 4.85544MB/s
Read-ahead success for size 65536

1.570047s, 5.3429MB/s
Read-ahead success for size 131072

1.085586s, 7.72726MB/s
Read-ahead success for size 262144

1.248655s, 6.71812MB/s
Read-ahead success for size 524288

1.276744s, 6.57031MB/s
Read-ahead success for size 1048576