1. Login to the Proxmox webGUI, select desired node and click on disks. In my case, my new hard drive device is labeled as /dev/sdc.
2. Open Proxmox console and create disk partitions:
Create new partition: n
Select primary partition type: p
Leave the first and the last sectors default (press enter twice).
Your new partition is now labeled the same as the hard drive device with an added number 1 (/dev/sdc1).
3. Create physical volume:
4. Create volume group:
vgcreate Hitachi500G /dev/sdc1
You can name volume group whatever you want, I named mine Hitachi500G.
Your new drive is now ready.
6. Create a shared directory on the proxmox host node (mount point)
Go to webGUI, click Datacenter -> Storage -> Add Directory
ID: custom name
Directory: enter your mount point
Content: Disk image, Container
7. Select your LXC container and shut it down. While your LXC container is selected, go to Resources and click Add -> Mount point
Mount point ID: 0
Storage: Select storage you created in step 4
Disk size: You can define a custom size for any mount point
Path: This is the directory you created in step 6