Restoring backup ERROR: Zend_Db_Statement_Exception: SQLSTATE[HY000]: General error: 1030 Got error

[Timo002]

I was restoring a backup via Plesk and suddenly I got this error while plesk was performing the backup:
ERROR: Zend_Db_Statement_Exception: SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine (Pdo.php:234)

Seems it has something to do with available storage?

If I free up space, how will I be able to start the backup process again while I can't login because plesk is broken. Can I start it over commandline?

Urgent advice because my whole VPS is not working at the moment. I can't login at Plesk and the websites are all down!

Edit:
The filesystem doesn't look it has no space.

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_plesk-lv_root
                      146G   76G   63G  55% /
tmpfs                 1,9G   12K  1,9G   1% /dev/shm
/dev/vda1             477M   57M  396M  13% /boot
/dev/mapper/vg_plesk-lv_tmp
                      1,5G   38M  1,4G   3% /tmp

Edit:
Never mind, seems all problems solved by patience...