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I have several VM installed on VMware ESXi 6 and I have a nagios server on one of this VM.
My problem is the that when I increase the disk space (20G --> 100G) of the VM where nagios is installed the new disk space is visible in VMware but for nagios there is still 20G in the disk.
I check with that command : df -h
You need to expand the logical volume to match the new physical disk size. Plenty of guides out there for doing that, though most of them will need to be modified slightly for your specific setup.
Prior to taking on that endeavor, I would highly recommend taking a VM snapshot.