System Architecture Feedback

I’m looking for some feedback on my Plex system architecture.

All my media is stored on a Synology DS 1621+, six 4 TB drives in RAID 6 with one acting as a hot spare. All four network ports are bonded into a 4G link to an Ubiquiti USW-48-POE.

Previously, I ran Plex in a Docker container on the NAS. This setup was stable; however, the NAS only has 4 GB of memory shared between Plex, several other Docker services, and regular DSM overhead. Plus, the processor is not very powerful (AMD Ryzen V1500B, ~5400 PassMark).

A few months ago I repurposed some old desktop PC parts to build a home lab Proxmox server (Core i7-6700K [~8900 PassMark], 32 GB memory, GTX 970, an old 2.5” SATA SSD for guest OS disks, 1G networking on the motherboard). I’m running Plex on an Ubuntu VM, with the GPU passed through directly to the guest OS. Plex is not containerized in Ubuntu. The VM has 8 CPU cores and 8 GiB memory (different units in Proxmox). My Plex media is accessed via a persistent NFS mount in Ubuntu (had been SMB before a DSM update broke something and the VM could no longer read the directory contents.)

The main purpose of the change from NAS to VM was to utilize the increased CPU/GPU horsepower and memory that I had lying around, but I worry that the added layers of complexity (hypervisor/VM, PCIe pass through, NFS mounts) will introduce more opportunities for performance issues. I have noticed more frequent hiccups/buffering/transcoding since the change but I’m not sure if it’s related to my setup or if those issues lie with client devices and/or the files themselves (e.g. weird file container type that the client can’t play natively).

Any critique or recommendations on system architecture? Should I get a dedicated NIC to pass through to my VM? Dedicated NVMe drive passed through as a guest OS disk? Ditch Proxmox altogether and go back to Synology Docker container?