文本Tag：
开始测试
首先从Oracle网站上下载。
解压到你指定的位置，我将其解压到Oracle Enterprise Linux 5 GA的tmp文件夹下，在Linux下你需要gunzip orion10.2_linux.gz，在Windows下你只需要运行MSI文件即可。
创建一个文件：我们创建了一个文件11gtest.lun，并将它添加到共享磁盘上，我们将用与Oracle 11g ASM和OCR文件。
将共享磁盘添加到文件中，我们添加了以下磁盘：
/dev/sdc1
/dev/sdd1
/dev/sde1
/dev/sdf1
使用dd命令检查所有选择的卷或磁盘，输入man dd查看其语法。
[root@vm11g01 dev]# dd if=/dev/sdc1 of=/dev/null bs=32k count=1024
1024+0 records in
1024+0 records out
33554432 bytes (34 MB) copied, 0.92155 seconds, 36.4 MB/s
检查你的平台查看是否已经为异步I/O安装了必要的库，libaio这个库应该安装在Oracle Linux版本下，Windows自动支持异步I/O。
Ok，一切就绪，我们将使用下面的命令启动测试：
[root@vm11g01 tmp]# ./orion -run simple -testname 11gtest -num_disks 4
ORION: ORacle IO Numbers -- Version 10.2.0.1.0
Test will take approximately 30 minutes
Larger caches may take longer
现在发生的是I/O负载水平并记录到输出文件中，总共产生了多个输出文件：
1.11gtest_summary 包括下面的数据输入参数，最大吞吐量，最大I/O速率和最小等待：
ORION VERSION 10.2.0.1.0
Commandline:
-run simple -testname 11gtest -num_disks 4
This maps to this test:
Test: 11gtest
Small IO size: 8 KB
Large IO size: 1024 KB
IO Types: Small Random IOs, Large Random IOs
Simulated Array Type: CONCAT
Write: 0%
Cache Size: Not Entered
Duration for each Data Point: 60 seconds
Small Columns:, 0
Large Columns:, 0, 1, 2, 3, 4, 5, 6, 7, 8
Total Data Points: 29
Name: /dev/sdc1 Size: 536854528
Name: /dev/sdd1 Size: 213893120
Name: /dev/sde1 Size: 4293563904
Name: /dev/sdf1 Size: 4293563904
4 FILEs found.
Maximum Large MBPS=34.47 @ Small=0 and Large=2
Maximum Small IOPS=185 @ Small=17 and Large=0
Minimum Small Latency=7.45 @ Small=1 and Large=0
2.11gtest_mbps.csv 这个文件包括大型随机/连续负载的数据传输速率(MBPS)，他们包括所有CSV文件(二维数据)，你必须要手工导入才能获得图形数据，或者保存为excel文件，然后绘制成图表，它看起来象什么呢?
Large/Small, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20
1, 28.91
2, 34.47
3, 34.22
4, 33.23
5, 31.90
6, 34.01
7, 32.96
8, 33.46
3.11gtest_iops.csv 这个文件包括小型随机负载I/O吞吐量结果，我们来看一看这个文件的内容：
Large/Small, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20
0, 134, 153, 160, 170, 170, 169, 176, 180, 161, 181, 179,
178, 183, 178, 177, 182, 185, 179, 173, 172
1
2
3
4
5
6
7
8
4.11gtest_lat.csv 小型随机负载等待结果，示例数据：
Large/Small, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20
0, 7.45, 13.01, 18.72, 23.52, 29.34, 35.34, 39.72, 44.23, 55.63, 55.08, 61.41,
67.13, 70.80, 78.50, 84.43, 87.84, 91.72, 100.50, 109.49, 116.13
1
2
3
4
5
6
7
8
5.11gtest_trace file：这个文件包括所有未加工的数据，开始和结尾如下：
TEST START
Point 1 (small=0, large=0) of 29
Valid small 1 Valid large 1
Valid
ran (small): VLun = 0 Size = 9337875456
ran (small): Index = 0 Count = 8048 Avg Lat = 7.45
ran (small): nio=8048 nior=8048 niow=0 req w%=0 act w%=0
ran (small): my 1 oth 0 iops 134 size 8 K lat 7.45 ms bw = 1.05 MBps dur 59.97 s READ
Point 2 (small=1, large=0) of 29
Valid small 1 Valid large 1
Valid
ran (small): VLun = 0 Size = 9337875456
ran (small): Index = 0 Count = 4610 Avg Lat = 13.00
ran (small): Index = 1 Count = 4599 Avg Lat = 13.02
ran (small): nio=9209 nior=9209 niow=0 req w%=0 act w%=0
ran (small): my 2 oth 0 iops 153 size 8 K lat 13.01 ms bw = 1.20 MBps dur 59.94 s READ
Point 3 (small=2, large=0) of 29
Valid small 1 Valid large 1
Valid
ran (small): VLun = 0 Size = 9337875456
ran (small): Index = 0 Count = 3205 Avg Lat = 18.70
ran (small): Index = 1 Count = 3197 Avg Lat = 18.75
ran (small): Index = 2 Count = 3199 Avg Lat = 18.73
ran (small): nio=9601 nior=9601 niow=0 req w%=0 act w%=0
ran (small): my 3 oth 0 iops 160 size 8 K lat 18.72 ms bw = 1.25 MBps dur 59.94 s READ
-
-
-
-
Point 27 (small=0, large=6) of 29
Valid small 1 Valid large 1
Valid
ran (large): VLun = 0 Size = 9337875456
ran (large): Index = 0 Count = 279 Avg Lat = 213.26
ran (large): Index = 1 Count = 281 Avg Lat = 212.17
ran (large): Index = 2 Count = 282 Avg Lat = 211.49
ran (large): Index = 3 Count = 281 Avg Lat = 212.03
ran (large): Index = 4 Count = 279 Avg Lat = 213.37
ran (large): Index = 5 Count = 282 Avg Lat = 211.42
ran (large): Index = 6 Count = 281 Avg Lat = 212.17
ran (large): nio=1965 nior=1965 niow=0 req w%=0 act w%=0
ran (large): my 7 oth 0 iops 32 size 1024 K lat 212.27 ms bw = 32.96 MBps dur 59.61 s READ
Point 28 (small=0, large=7) of 29
Valid small 1 Valid large 1
Valid
ran (large): VLun = 0 Size = 9337875456
ran (large): Index = 0 Count = 247 Avg Lat = 240.04
ran (large): Index = 1 Count = 247 Avg Lat = 240.69
ran (large): Index = 2 Count = 245 Avg Lat = 240.33
ran (large): Index = 3 Count = 251 Avg Lat = 235.70
ran (large): Index = 4 Count = 254 Avg Lat = 232.80
ran (large): Index = 5 Count = 250 Avg Lat = 235.24
ran (large): Index = 6 Count = 247 Avg Lat = 240.24
ran (large): Index = 7 Count = 243 Avg Lat = 243.83
ran (large): nio=1984 nior=1984 niow=0 req w%=0 act w%=0
ran (large): my 8 oth 0 iops 33 size 1024 K lat 238.56 ms bw = 33.46 MBps dur 59.30 s READ
Point 29 (small=0, large=8) of 29
Valid small 1 Valid large 1
Valid
TEST END
使用外部磁盘：我建议使用FireWire 400/800，500GB。
总结
Orion是一个伟大的测试硬件I/O状态的工具，一个配置不当的磁盘I/O性能会很低，这样的磁盘也不应该出现在你的Oracle RAC中。
