== sanity test 101b: check stride-io mode read-ahead =========================================================================== 02:13:23 (1788848003)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.559656s, 5.3785MB/s
Read-ahead success for size 8192

1.587364s, 5.28462MB/s
Read-ahead success for size 16384

1.765295s, 4.75196MB/s
Read-ahead success for size 32768

1.387514s, 6.04578MB/s
Read-ahead success for size 65536

1.217677s, 6.88903MB/s
Read-ahead success for size 131072

0.948626s, 8.8429MB/s
Read-ahead success for size 262144

1.082932s, 7.7462MB/s
Read-ahead success for size 524288

0.861993s, 9.73164MB/s
Read-ahead success for size 1048576