For intensive NAS tasks, you’ll need MD Raid and Ceph clusters configured on your Proxmox nodes, which can get rather complex when you’re just starting out.

I have proxmox+ceph but you'd want at least 5 machines to start, 10 is better. In my case with 40G Ethernet and SATA SSDs. It works OK, I wouldn't want to use it on anything slower like spinning disk.

For starters, Proxmox is compatible with ZFS, GlusterFS, and even BTRFS file systems. But if you want to take things to the next level, thereâ s no beating the Ceph distributed file system.