== sanity test 101b: check stride-io mode read-ahead =========================================================================== 19:16:21 (1787786181)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.513302s, 5.54325MB/s
Read-ahead success for size 8192

2.016810s, 4.15934MB/s
Read-ahead success for size 16384

1.676908s, 5.00243MB/s
Read-ahead success for size 32768

1.800538s, 4.65895MB/s
Read-ahead success for size 65536

1.613100s, 5.2003MB/s
Read-ahead success for size 131072

1.584079s, 5.29557MB/s
Read-ahead success for size 262144

1.309847s, 6.40427MB/s
Read-ahead success for size 524288

1.241835s, 6.75501MB/s
Read-ahead success for size 1048576