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"Domain disk space" and "Hard disk quota". What is the difference?

Plesk for Linux/Unix

"Domain disk space" indicates how much disk space is used by whole domain. It is counted by Plesk statistics utility and includes amount of disk space taken by web pages, mail accounts, databases and other domain data including options specified in statistic settings on Server -> Server preferences page in Plesk CP. This cannot be hard, because it is made from different parts that were listed above. If a domain exceeds "Domain disk space" limit, the both the server administrator and the domain owner receive notifications about it. Domain disk space can be configured on the domain's limit page Domains -> DOMAIN_NAME -> Limits -> Disk space.

"Hard disk quota" is a file system feature and it limits how much disk space can be taken by files which are owned by a specific system account (either domain FTP user or webuser or subdomain FTP user). This file system quota cannot be exceeded and if the limit is reached, the system user will not be able to create files anymore but error "no more space left on device" will appear. You can set domain hard disk quota on the domain hosting setup page Domains -> DOMAIN_NAME -> Setup -> Hard disk quota.