4.为了理解存储性能使用只读，小与大的随机I/O工作量:
[oracle@jyrac1 bin]$ ./orion -run simple -testname jytest
ORION: ORacle IO Numbers -- Version 11.2.0.4.0
jytest_20161012_2122
Calibration will take approximately 23 minutes.
Using a large value for -cache_size may take longer.
Maximum Large MBPS=125.09 @ Small=0 and Large=6
Maximum Small IOPS=696 @ Small=15 and Large=0
Small Read Latency: avg=21501 us, min=807 us, max=351786 us, std dev=22448 us @ Small=15 and Large=0