== sanity test 101b: check stride-io mode read-ahead =========================================================================== 03:39:37 (1787125177)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.695561s, 4.94739MB/s
Read-ahead success for size 8192

1.436934s, 5.83785MB/s
Read-ahead success for size 16384

1.735711s, 4.83295MB/s
Read-ahead success for size 32768

1.836878s, 4.56677MB/s
Read-ahead success for size 65536

1.411880s, 5.94145MB/s
Read-ahead success for size 131072

2.210256s, 3.79531MB/s
Read-ahead success for size 262144

1.980960s, 4.23462MB/s
Read-ahead success for size 524288

2.083279s, 4.02664MB/s
Read-ahead success for size 1048576