tps 和 iops 区别

这两个区别我一直没搞到合理而又深刻的解释

现在我摘抄一段英文注释：

• tps
  Indicate the number of transfers per second that were
  issued to the device. A transfer is an I/O request to the
  device. Multiple logical requests can be combined into a
  single I/O request to the device. A transfer is of inde-
  terminate size.

这样貌似说明名了tps能反映iops，但是很多的请求是否会有响应？或者合并请求过程什么的对它是否有影响？

有待研究。

先挖一个坑，慢慢研究。