lvmcachestat displays LVM cache statistics. This repository aims to rework an earlier utility to output in similar format to iostat.

Usage:

lvmcachestat VolumeGroup/LogicalVolume

History:

• Copyright (C) 2014 Armin Hammer
• 20141220: hammerar: initial version
• 20161230: rocketraman: Fix core and policy args count
• 20230309: poddmo: rename to lvmcachestat. Begin to recode the output in the style of iostat

Cache measurement references:

• https://www.kernel.org/doc/Documentation/device-mapper/cache.txt
• https://en.wikipedia.org/wiki/Cache_performance_measurement_and_metric
• https://oneuptime.com/blog/post/2026-03-04-monitor-cache-hit-ratios-performance-rhel-9/view#what-good-numbers-look-like