If you create an LXC, then go to Resources --> Add --> Mount point, then you can basically just mount the proxmox drives / folder as a folder within the LXC environment.

A bind mount kind of shares a directory on the host with the container. To do it, unless something’s changed in the UI that I don’t remember, you have to edit the LXC config file and add something like:

mp0: /path/on/host,mp=/path/in/container

I usually make a sharing dataset and use that as the target.

Ah you are right! My bad. Thanks for clearing that up!

I'm curious. Where is the problem with small drives for RAID5? Too many writes for such a small drive?

I personally created the ZFS zpool within proxmox so I had all the space I could give to any of the containers I needed. Then when you create a container, you add a mount point and select the pool as the source and specify the size you want to start with. Then as your needs grow, you can add space to that mount point within proxmox.

Say you have a 6 TB zpool and you create a dataset that is allocated 1 TB. Within that container, you will see a mount point with a size of 1 TB, but in proxmox, you will see that you still have 6TB free because that space isn't used yet. Your containers are basically just quota'ed directories inside the Proxmox hosts's filesystem when you use zpool. And you are free to go into that container's settings and add space to that quota as your needs grow.