== sanity test 101b: check stride-io mode read-ahead =========================================================================== 07:20:21 (1788866421)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.175888s, 7.13385MB/s
Read-ahead success for size 8192

1.491297s, 5.62504MB/s
Read-ahead success for size 16384

1.767932s, 4.74487MB/s
Read-ahead success for size 32768

1.625881s, 5.15942MB/s
Read-ahead success for size 65536

1.198702s, 6.99808MB/s
Read-ahead success for size 131072

1.993633s, 4.2077MB/s
Read-ahead success for size 262144

1.388815s, 6.04012MB/s
Read-ahead success for size 524288

1.558219s, 5.38346MB/s
Read-ahead success for size 1048576