Changing group ownership

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http://forums.fedoraforum.org – I have a directory what is mounted to a logical-volume, currently the owner/group owner is root. I would like to permanently change the group owner to vboxuser. Everytime I change it using chgrp is makes the change but when I reboot it reverts to root as the group owner. How would I be able to permanently make the change. (HowTos)