rootvg includes the base /dev/vda disk./dev/vdb is mounted by default to /data but can be added to rootvg so you can extend rootlv (the / mount point) as necessary./data storage.rootvg includes the base /dev/vda disk./dev/vdb is mounted by default to /data but can be added to rootvg so you can extend rootlv (the / mount point) as necessary./data storage.rootvg includes the base /dev/vda disk./dev/vdb is mounted by default to /data but can be added to rootvg so you can extend rootlv (the / mount point) as necessary./data storage./, /usr, /var, and /home which can all be extended because they are part of the rootvg volume group.