LVM Cache monitoring template.

 allows you to evaluate the efficiency of caching by the built-in dm-cache mechanism.

What do these values mean?

Details about monitored values described in Linux Kernel Documentation https://www.kernel.org/doc/Documentation/device-mapper/cache.txt

Usage

1. Put file lvmcache.conf to /etc/zabbix/zabbix_agent.d/
2. Put file sudoers_lvmcache to /etc/sudoers.d/ (you need sudo program installed)
3. Put file vmcache to /etc/zabbix/scripts/. Then you can execut this file and test. This script produces JSON output.
4. Import the lvmcache_template.xml into your Zabbix server (click on the Raw button to download)
5. Add the template to your host
6. Check if new data arrives at Last Data section and Graphs.

This script assumes that you have ONLY ONE caching device and polls the first device. Therefore, it does not require configuration and specifying a device name. Working with disks implies elevated privileges and therefore you need do not forget about sudoers_zabbix_lvmcache file.

Commands for debugging

• dmsetup status
• /etc/zabbix/scripts/lvmcache
• zabbix_get -s 192.168.1.1 -k 'lvmcache.raw' (on zabbix server or zabbix proxy)