Hi,
Yesterday we scheduled backups trough Plesk 12 to store, trough FTP, on our cloudserver. This morning we got allerted that Plesk was unavailable and gave the error (simular):
1030 Got error 28 from storage engine
So, we checked the space usages on the mounted /tmp drives and this...
This worked for me;
Confirm you are running SELINUX (you should, really!)
Run the following commands as root trough SSH;
For FTP access it may be necessary to set SELinux booleans with:
setsebool -P ftp_home_dir 1
and possibly also
setsebool -P allow_ftpd_full_access 1
I got the same issue here. Have you figured it out? It appears that editing files withing Plesk and saving them let them show up again... but that's no real solution.