Proxmox VE vs unRAID for a 24/7 Home Lab: ZFS Storage Pools, Power Draw, and Hardware Passthrough

Rack-mounted home server cluster with status LEDs and SAS backplanes.

I Ran Both Hypervisors for 14 Months on the Same Hardware. Here's What Actually Matters.

The home server unRAID vs Proxmox debate generates endless forum threads where people argue from spec sheets instead of uptime logs. I pulled my unRAID license off a Dell PowerEdge T340 in March 2023 and installed Proxmox VE 8.0 on the same iron. Then I ran both platforms in parallel across two nearly identical machines for over a year, tracking power draw at the wall, ZFS scrub times, passthrough success rates, and every kernel panic in between. This is what I found.

The Test Rigs — Same Silicon, Different Philosophy

Both systems ran Xeon E-2278G processors (8C/16T), 64GB ECC DDR4-2666, and an LSI 9300-8i HBA flashed to IT mode. Storage was six Seagate Exos X18 18TB drives plus two Samsung 870 EVO 1TB SSDs for cache/special vdevs. The GPU for passthrough testing was an NVIDIA Quadro P2200. PSU on both: Seasonic Focus GX-550. Power measured with a Kill A Watt P3 meter, logged every 60 seconds via a Raspberry Pi script over 30-day windows.

Why identical hardware? Because the moment you change a single drive controller or NIC, you're no longer comparing software. You're comparing your ability to shop.

Idle Power Draw: The Number That Pays Your Electric Bill

With six spinning drives and two SSDs, no VMs running, network idle:

• unRAID 6.12.6: 68W average at the wall. Array stopped (drives spun down): 41W.
• Proxmox VE 8.1 with ZFS: 72W average. No spin-down equivalent because ZFS pools don't support individual drive spin-down without destroying resilience guarantees.

That 4W delta seems trivial until you multiply it by 8,760 hours. It's roughly 35 kWh per year, which at $0.14/kWh is about $5. Not a dealbreaker. But unRAID's ability to spin down idle drives in a parity array drops it to 41W — and that gap over a year becomes ~270 kWh, or $38. For a lab running media storage that gets hit a few hours a day, that matters.

Proxmox with ZFS keeps all pool members spinning. Period. There are hacky workarounds involving zpool export and cron jobs, but you'll corrupt data eventually. Don't do it.

ZFS on Proxmox vs. unRAID's Parity System: Not Even the Same Sport

unRAID uses a custom parity scheme that lets you mix drive sizes freely. A 4TB drive next to an 18TB drive? Fine. Your parity drive just needs to be as large as the biggest data drive. Files are stored as complete, individual files on single drives — meaning a drive failure only loses the files on that one disk (recoverable via parity rebuild). This is elegant for media hoarders who add drives one at a time over years.

ZFS on Proxmox is a completely different animal. I configured a RAIDZ2 vdev across the six Exos drives (roughly 72TB raw, ~54TB usable) with a special metadata vdev on the SSDs. ZFS checksums every block, self-heals on read, and scrubs caught 3 silent bit errors across 14 months that unRAID's parity system would have silently baked into the parity data.

Monthly scrub times on the RAIDZ2 pool with ~31TB of data: approximately 14 hours. Run it Sunday at 2 AM with systemctl edit zfs-scrub-monthly@rpool.timer or a simple cron entry:

0 2 * * 0 /sbin/zpool scrub tank

The tradeoff: you cannot just shove a random 8TB drive into a ZFS RAIDZ2 vdev built on 18TB disks. Expansion was historically painful — you had to add entire new vdevs. OpenZFS 2.3 (landing in Proxmox kernel 6.8+) finally adds RAIDZ expansion, but as of my testing it's still flagged as experimental. I tested it on a scratch pool; it worked but took 47 hours to redistribute 20TB of data across a 5-disk RAIDZ1 expanded to 6 disks.

GPU and NVMe Passthrough: Where Proxmox Wins Outright

Passing the Quadro P2200 to a Windows 11 VM on Proxmox required editing /etc/default/grub to add IOMMU flags:

GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on iommu=pt"

Then blacklisting the nouveau driver, adding the GPU's PCI IDs to vfio-pci, and configuring the VM with machine type q35 and OVMF BIOS. Total setup time: about 25 minutes if you've done it before. The VM saw the GPU natively. Plex hardware transcoding worked. DaVinci Resolve ran inside the VM with full CUDA access. Latency on the GPU passthrough measured via LatencyMon inside the guest: sub-300μs DPC latency consistently.

unRAID supports GPU passthrough too, but it fights you. The implementation routes through a libvirt/QEMU layer that's identical under the hood, yet the web UI obscures IOMMU group details. When my IOMMU groups weren't clean (the T340's BIOS lumps the GPU with a USB controller in group 1), Proxmox let me apply an ACS override patch with a kernel parameter. unRAID required installing a plugin, editing syslinux config manually, and rebooting twice before the override took effect. Same result, triple the friction.

NVMe passthrough to a VM for a dedicated database server was straightforward on Proxmox — just assign the PCI device. On unRAID, the NVMe was already claimed by the cache pool system. You have to exclude it from the array/cache entirely through the UI, then manually configure the XML for the VM. It works, but you're fighting the platform's assumptions about what NVMe drives are "for."

Container Density and Memory Overhead

Proxmox's LXC containers are absurdly efficient. I ran 11 LXC containers (Pi-hole, Nginx Proxy Manager, Grafana, InfluxDB, Home Assistant, Mosquitto, Wireguard, Paperless-ngx, Vaultwarden, Gitea, Uptime Kuma) consuming a combined 3.8GB of RAM. The same services in unRAID's Docker consumed 6.1GB. Docker's overlay filesystem and per-container daemon overhead adds up fast when you're running a dozen services.

Proxmox also lets you mix LXC containers and full KVM VMs on the same host with fine-grained resource controls — CPU pinning per container, memory ballooning, NUMA awareness. unRAID's VM manager is functional but basic. You get CPU core assignment and a RAM allocation slider. That's about it.

What Breaks and When

Proxmox broke on me twice: once after a point release upgrade (8.0 to 8.1) where the ZFS module failed to rebuild against the new kernel. Fix was manual dkms autoinstall from recovery. Second time was a silent networking failure after modifying /etc/network/interfaces with a typo in a bridge config — no safety net, just a drive to the basement with a monitor.

unRAID broke once: a Docker image auto-update (Watchtower-style community plugin) pulled a bad Plex container that consumed 100% CPU and made the web UI unresponsive. Had to SSH in and docker stop manually. The platform's reliance on community plugins for basic functionality (GPU drivers, ZFS support, scheduled tasks) means you're trusting maintainers who sometimes disappear.

The Workbench Verdict

Choose unRAID if your primary use case is bulk media storage with mixed drive sizes, you want drives to spin down, and your VM/container needs are modest. The $59 Basic license gets you going fast, and the community app ecosystem is genuinely good for Plex-centric setups. Just understand that you're trading storage integrity guarantees and hypervisor flexibility for simplicity.

Choose Proxmox if you want proper ZFS data integrity, serious hardware passthrough, LXC container density, and the ability to treat your home lab like a real virtualization cluster. It's free (the subscription only gates the enterprise repo — the no-subscription repo works fine), but it demands you're comfortable in a terminal and willing to read actual man pages.

If someone tells you one of these platforms is objectively better than the other, they've only used one of them.

Labels: Tech Tutorials, Tech Tutorials, PC Optimization, Creator Playbook, HAWX TECH