Adding a usb-drive to a volume group... possible?

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http://www.linuxquestions.org – Hi forum, I'm thinking to get a new external hard disk and using vgextend to add it to a logical volume I have set up that needs to be pretty big. Can this work, and if yes, what would happen if the externel drive became unplugged for instance... would that bork the logical volume and perhaps cause irretrevable data loss? Any advise appreciated. (HowTos)