【讨论中】innodb_pages_read 与 innodb_buffer_pool_reads区别疑惑

hsu_wp

Innodb_buffer_pool_reads
The number of logical reads that InnoDB could not satisfy from the buffer pool, and had to read directly from the disk.

Innodb_pages_read
The number of pages read.
这2个变量是不同的,Innodb_pages_read 的值似乎一直大于Innodb_buffer_pool_reads,文档中对于Innodb_pages_read似乎介绍过于简单，这个状态变量代表什么？ 如果也是一种逻辑到物理的读取，那么似乎innodb_buffer_pool_read_requests 应该等于Innodb_pages_read,
取线上的几台服务器的状态变量的值，发现：
Innodb_buffer_pool_read_requests > (much >) Innodb_pages_read > Innodb_buffer_pool_reads
疑问：innodb_buffer_pool_reads在文档中说的很清楚，我们可以通过它与innodb_buffer_pool_read_requests 计算innodb引擎的失配率，那么innodb_pages_read 代表的是什么？通过它我们能知道Innodb的什么状态信息？

devilkin0312

http://www.itpub.net/thread-1756632-1-1.html