Sorry but you HAVE to go with rescue disk.
parted /dev/sdb
(parted) mklabel gpt
(parted) mkpart primary 0GB 100%
(parted) print
(parted) q
parted /dev/sda
(parted) mklabel gpt
(parted) mkpart primary 0GB 100%
(parted) print
(parted) q
root@rescue ~ # pvcreate /dev/sda1
Writing physical volume data to disk "/dev/sda1"
Physical volume "/dev/sda1" successfully created
root@rescue ~ # pvcreate /dev/sdb1
Writing physical volume data to disk "/dev/sdb1"
Physical volume "/dev/sdb1" successfully created
root@rescue ~ # pvs
PV VG Fmt Attr PSize PFree
/dev/sda1 lvm2 a-- 2.73t 2.73t
/dev/sdb1 lvm2 a-- 2.73t 2.73t
root@rescue ~ # vgcreate storage /dev/sda1 /dev/sdb1
Volume group "storage" successfully created
root@rescue ~ # vgs
VG #PV #LV #SN Attr VSize VFree
storage 2 0 0 wz--n- 5.46t 5.46t