- Plesk for Linux
Disk space is almost full on Plesk server. How to increase it?
Resizing disk partitions is not related to Plesk functionality, this is a system administrative task and falls out of free Plesk Technical support.
If the server is running on LVM, the following article may be of help:
How to resize hard drive on Linux systems with LVM?
Also consider requesting assistance from Plesk Professional Service Team at https://www.plesk.com/professional-services/administrative-services/