I have a problem that the user's used space is only 1.8G,but when i check the website quotas (hardisk) with in the ispconfig have 5G,how i can fix it?It mean that ispconfig cannot update the used space after the client have deleted files in their web directory.
Not quite sure what you mean. The quotas are Linux file system quotas, ispconfig uis not updating them. They get updated by the filesystem automatically when a file gets deleted, ispconfig is not involved in that. If you wnat to check quotas, then use the command: repquota -avug