Plesk

Hard Drive Partitioning for Plesk

By default, Plesk for Linux stores user data in the /var directory.
To achieve optimal result, we recommend partitioning the server hard
disk as follows:

Partition Recommended Size
SWAP Refer to the OS vendor recommendation (usually at least the
amount of RAM on the server times two).
/ 20GB minimum, 50GB recommended. This partition will be used for
the OS and Plesk updates.
/tmp At least 3GB recommended.
/var The rest of the unallocated disk space. This partition will
hold all Plesk domains, mail, backups, and databases.

Pay attention to the following directories - they may hold large amounts
of data:

These directories can be changed by editing the /etc/psa/psa.conf
file (for example, if you want to change the location of the directory
in which the website data is stored).