MySQL InnoDB使用 Raid 1+0 stripe size 大小该如何配置？ By: 谭俊青@MySQL实验室 要理解Raid 1+0，我们首先要先理解Raid 0，看下图： 左图为 4kb stripe size；右图为 64kb stripe size 存储文件大小：红色:4kiB，蓝色:20kiB，绿色:100kiB，紫色:500kiB Ra
MySQL InnoDB使用 Raid 1+0 stripe size 大小该如何配置？
By: 谭俊青@MySQL实验室
要理解Raid 1+0，我们首先要先理解Raid 0，看下图：
左图为 4kb stripe size；右图为 64kb stripe size
存储文件大小：红色:4kiB，蓝色:20kiB，绿色:100kiB，紫色:500kiB
Raid 0 准确的来说应该称 AID 0
大家可以看到，如果stripe size设置过大，在单线程的情况下起不到提速作用。而设置过小又会产生多次IO操作。因此我们通过简化模型，将大部分请求的文件块大小（IO_SIZE）除以RAID0 的磁盘数量（DISK_NUM）来估算stripe size大小（stripe size＝IO_SIZE / DISK_NUM）。
比如MySQL InnoDB，假设平时大部分请求文件块的大小为1M（16kb＊64）,那么在8块盘组成的Raid1＋0的情况下stripe size＝1024kb / 4 = 256kb。这时候将Raid的条带大小配置为256kb是比较合适的。MyISAM存储引擎使用情况相对复杂。
实际上管理和磁盘定位等还有一定开销，更为主要的是不同的业务，请求的文件块大小相差很大，所以在实际环境中很难一刀切说多大的stripe size最佳，因此在估算之后可以上下浮动评测，选择适合自己系统的最优大小的stripe size。
顺便今天在MySQL实验室的2个群里调查了下，stripe size大小为64kb、256kb基本各占50％。
－－ －－－－－－－－－－－－－
SDO：测试下8块及以上盘阵 strip size 256k最佳
点评网：256k
畅游：512k 综合效果更好 （来源评论）
继续统计更新…
Related posts:
- InnoDB Plugin 1.0.4 for MySQL 5.1.37
- InnoDB plugin 1.0.7
- NoSQL到MySQL+Memcache(d)重树MySQL王者地位
- MySQL5.5与MySQL5.1 性能(比较)对比测试
- MySQL Cluster致命缺点
? 谭俊青 发布在 MySQL性能、MySQL Cluster集群、MySQL HA高可用等研究 - MySQL实验室, 2011.
可以任意转载, 但转载时务必以超链接形式标明文章原始出处 和 作者信息。
链接: http://www.mysqlab.net/blog/2011/12/raid10-stripe-size-for-mysql-innodb/
标签: Raid, stripe size
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