I've been trying to follow the following guide to set up RAID1:
<https://www.howtoforge.com/set-up-raid1-on-a-running-lvm-system-debian-etch>

I currently have two 6TB hard drives, I created a physical volume directly on one of them, the other is brand new and untouched.

```
sdc                8:32   0   5.5T  0 disk
├─DATA-user_data 254:0    0     4T  0 lvm
└─DATA-app_data  254:1    0     1T  0 lvm
sdd                8:48   0   5.5T  0 disk

```

The `sdc` physical volume has a single volume group on it containing two logical volumes

```
root@server:# pvscan
  PV /dev/sdc   VG DATA            lvm2 [5.46 TiB / 469.03 GiB free]
  Total: 1 [5.46 TiB] / in use: 1 [5.46 TiB] / in no VG: 0 [0   ]
root@server:# vgscan
  Reading volume groups from cache.
  Found volume group "DATA" using metadata type lvm2
root@server:# lvscan
  ACTIVE            '/dev/DATA/user_data' [4.00 TiB] inherit
  ACTIVE            '/dev/DATA/app_data' [1.00 TiB] inherit

```

I've come to the point in the guide where I need to copy the partition table from `sdc` to `sdd`, but of course this isn't possible as `sdc` doesn't have a partition table on it.

How can I setup RAID1 with `sdc` and `sdd`?