这篇博客详细记录了使用模拟器进行RAID（0, 1, 4, 5）不同级别的映射测试，包括左对称和左不对称布局的RAID-5。博主探讨了如何根据地址计算磁盘和偏移量，并观察了chunk大小和请求大小变化对I/O模式的影响。此外，还研究了不同RAID级别在随机读写和顺序工作负载下的性能表现，讨论了RAID-4和RAID-5在容错性和效率上的差异。"
109467882,10187737,"Python数据分析入门：Numpy, Pandas, Matplotlib与Scikit-learn
- Use the simulator to perform some basic RAID mapping tests. Run with different levels (0, 1, 4, 5) and see if you can figure out the mappings of a set of requests. For RAID-5, see if you can figure out the difference between left-symmetric and left-asymmetric layouts. Use some different random seeds to generate different problems than above.
首先：RAID0 zsydeMacBook-Pro:HW-Raid zsy$ ./raid.py -n 5 -L 0 -R 20
这是怎么求的呢？
Disk = address % number_of_disks
offset = address / number_of_disks
所以按照老师给的ppt上是这样的
所以结果应该是：
addr:16
read [disk 0, offset 4]
addr:8
read [disk 0, offset 2]
addr:10
read [disk 2, offset 2]
addr:15
read [disk 3, offset 3]
addr:9
read [disk 1, offset 2]
RAID1:zsydeMacBook-Pro:HW-Raid zsy$ ./raid.py -n 5 -L 1 -R 20
结果是：
LOGICAL READ from addr:16 size:4096
read [disk 0, offset 8]
LOGICAL READ from addr:8 size:4096
read [disk 0, offset 4]
LOGICAL READ from addr:10 size:4096
read [disk 1, offset 5]
LOGICAL READ from addr:15 size:4096
read [disk 3, offset 7]
LOGICAL READ from addr:9 size:4096
read [disk 2, offset 4]
RAID4 zsydeMacBook-Pro:HW-Raid zsy$ ./raid.py -n 5 -L 4 -R 20
结果应该：
LOGICAL READ from addr:16 size:4096
read [disk 1, offset 5]
LOGICAL READ from addr:8 size:4096
read [disk 2, offset 2]
LOGICAL READ from addr:10 size:4096
read [disk 1, offset 3]
LOGICAL READ from addr:15 size:4096
read [disk 0, offset 5]
LOGICAL READ from addr:9 size:4096
read [disk 0, offset 3]
RAID5:
这个有分几种情况：
这是readme给出的
1、左对称（Left-symmetric）；
2、左不对称（Left-asymmetric）；
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