The purpose of the flashstat command is to periodically display flashcache statistic information


flashstat [-h] [-i <time Interval>] [-C <count>] [-d <device>] [-n]


-h, --help

Print help info

-i, --interval

Time(second) interval, the default value is 1s

-C, --count

Display times

-d, --device

Flashcache device, the default device is /dev/mapper/cachedev

-n, --nocolor

No color mode


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%)

RELATED TO flashstat…

README and other documents in /usr/share/doc/flashcache-utils

The flashcache source code and all documentation may be downloaded from <>.


Flashstat is developed by NinGoo <[email protected]>

This man page was written by Liang Guo <[email protected]> for Debian GNU/Linux (but may be used by others).