Flashstat的项目地址为：https://github.com/NinGoo/flashstat，和Mohan讨论过后，他已经将这个小工具接纳并merge到了主干代码，因此现在下载Flashcache的源码，已经在utils目录中包含了这个小工具，希望对Flashcache的用户有点用处。
Flashstat的用法很简单，指定监控时间间隔（-i 默认1s），监控次数（-c 默认0表示一直监控），flashcache设备（-d 默认/dev/mapper/cachedev）即可。如果需要将结果重定向到文件，则建议关闭ANSI颜色显示，使用-n或者–nocolor选项即可。
read/s reads per second for cachedev write/s writes per second for cachedev diskr/s disk reads per second diskw/s disk writes per second ssdr/s ssd reads per second ssdw/s ssd writes per second uread/s uncached reads per second uwrit/s uncached writes per second metaw/s metadata ssd writes per second clean/s cleanings per second repl/s replacement per second wrepl/s write replacement per second hit% read hit percent(current hit%|total hit%) whit% write hit percent(current whit%|total whit%) dwhit% dirty write hit percent(current dwhit%|total dwhit%)