In OA control panel one value of the diskspace usage of an NG hosting subscription is shown:
1000001 Diskspace 10 GB 20 GB Jan-1-2017 01:00
du command on the webspace folder on the webserver shows a different value:
[root@ngweb ~]# du -sh /var/www/vhosts/1/100001/ 1G /var/www/vhosts/1/100001/
quota command for the correspondent user shows a value that is close to the one shown in OA CP:
[root@ngweb ~]# quota -v 100001 Disk quotas for user u100001 (uid 100001): Filesystem blocks quota limit grace files quota limit grace /dev/root 10276644 20485760 21534336 none 15051 0 0
The webspace user does not have any files owned by him in other folders besides his webspace folder. This can be checked with a command like below:
[root@ngweb ~]# find / -user u100001
Quota was not calculated correctly by the server.
quotacheck utility on the server to update and correct the quota values. Please note that in general case it remounts the filesystem as read-only to prevent any write operations when the check is ongoing, so it is better to schedule a maintenance window for this task.