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WHM/Cpanel running on OpenVZ VPS does not show the user quota correctly.

[root@server ~]# quotacheck -agiuv
quotacheck: Can't find filesystem to check or filesystem not mounted with quota option.

Make sure that the second level quota support is enabled.

To enable second level quota support from the Host OS:
# vzctl set --quotaugidlimit 500 --save
# vzctl restart

Increase the size of tmpDSK (/tmp) in cPanel

You may have noticed that cPanel’s default partition size for /tmp is
512 MB, which in some cases can be way too small. And sometime you probably get this report email:

Drive Critical: /usr/tmpDSK (/tmp) is 100% full

Although cPanel automatically deletes the unused files, the /tmp would be getting full very quickly on a busy server.

The /tmp partition on cPanel servers, assuming it was the one cPanel created and not one you did yourself, is a file-based partition that can easily be resized.