== sanity test 101b: check stride-io mode read-ahead =========================================================================== 21:12:33 (1786669953)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.872969s, 4.47878MB/s
Read-ahead success for size 8192

2.550814s, 3.2886MB/s
Read-ahead success for size 16384

3.064372s, 2.73746MB/s
Read-ahead success for size 32768

2.805315s, 2.99026MB/s
Read-ahead success for size 65536

1.391062s, 6.03036MB/s
Read-ahead success for size 131072

1.873423s, 4.47769MB/s
Read-ahead success for size 262144

1.460582s, 5.74333MB/s
Read-ahead success for size 524288

1.483001s, 5.65651MB/s
Read-ahead success for size 1048576