== sanity test 101b: check stride-io mode read-ahead =========================================================================== 23:24:12 (1790738652)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.353867s, 6.19604MB/s
Read-ahead success for size 8192

1.616082s, 5.19071MB/s
Read-ahead success for size 16384

1.697670s, 4.94125MB/s
Read-ahead success for size 32768

1.360185s, 6.16726MB/s
Read-ahead success for size 65536

1.651900s, 5.07816MB/s
Read-ahead success for size 131072

1.018199s, 8.23867MB/s
Read-ahead success for size 262144

0.982658s, 8.53665MB/s
Read-ahead success for size 524288

0.861485s, 9.73738MB/s
Read-ahead success for size 1048576