using pvesm to add the storage worked.
pvesm add lvmthin pve6-storage2 --thinpool=pve6-storage2 --vgname=pve6-storage2 --content=rootdir,images --nodes=E0334-pve6
pvesm add dir pve6-storage1 --path=/mnt/pve/pve6-storage1 --content=rootdir,backup,iso,snippets,vztmpl,images --is_mountpoint=1...