== sanity test 101b: check stride-io mode read-ahead =========================================================================== 11:11:56 (1788793916)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.887137s, 4.44515MB/s
Read-ahead success for size 8192

1.402372s, 5.98173MB/s
Read-ahead success for size 16384

1.396655s, 6.00621MB/s
Read-ahead success for size 32768

1.980501s, 4.2356MB/s
Read-ahead success for size 65536

1.545715s, 5.42701MB/s
Read-ahead success for size 131072

1.386316s, 6.05101MB/s
Read-ahead success for size 262144

1.210455s, 6.93013MB/s
Read-ahead success for size 524288

1.045932s, 8.02022MB/s
Read-ahead success for size 1048576