StatsDawg

This graph shows not only the number of reads and writes, but also the number of fsyncs as well as the number of pending fsyncs, reads, and writes. All this basically can tell how much disk I/O the InnoDB engine is causing which can indicate that the InnoDB engine could use some tweaking. By fast the simplest tweak is to increase the buffer pool size, which can you do by manipulating the innodb_buffer_pool_size variable MySQL.