I have a server that I can access through SSH. There is no KVM available and there's only one root partition for the whole server. I have deleted some files that I shouldn't have and want to recover them with extundelete ( http://extundelete.sourceforge.net/ ). For this I need to unmount the targeted file system.
Is there a way to unmount the root file system without rebooting? Maybe by doing something similar to what initrd does to boot a system before mounting the root filesystem on some systems?