So I needed to upgrade my mail server but realized I only had 5GB of space left on the /opt partition and the upgrade complained about needing more than 5GB. Not sure why I didn’t size the whole virtual disk a little bigger in the first place. Also not sure why I didn’t set Zabbix to warn me when the disk space got that low. Hindsight and all of that. So following other’s recipes this is how I resized my LVM based virtual disk, and then subsequently resized the partitions within the VM.