I have installed omv on a USB thumbdrive and added hard disks after the installation (an installation on a thumbdrive with plugged in hard disks was not possible).
When I do a restart of the system using omv itself, the GRUB loader loads successfully the operatig system. But when I power off the device and power on it again, GRUB reports "invalid file system, entering rescue mode".
I would appreciate any hint on how to get this fixed.