It has an HBA, 3 hard drives, and 3 SSDs. I was going to add a couple more hard drives (just to try to get some more use out of old ones I had lying around), but 0.5TB ones might not have enough capacity to be worth their power draw.

Like a VM virtual disk? Those are exclusive to each VM and can’t be shared, so if you want multiple VMs to access the same data then NFS would be needed.

But containers with bind mounts don’t have that limitation and multiple containers can access the same data (such as media).

Just to be clear, are you saying that when you’re using bind-mounted ZFS pools, it’s okay to write from two containers (or both the proxmox host and a container) at the same time?

Also, I think I managed to accomplish that for a VM by creating a Proxmox Directory pointing to a path in a zpool, adding it to the VM using virtiofs, and mounting it within the VM. I’m not sure if writes from both the VM and the host are safe in that case either, though.

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Like for example a finance management software that can hook into my bank

What software would that be? I’ve been looking for a viable self-hosted alternative to Mint (and now Monarch Money) since forever.

Medieval-style bloodletting…