TrueNAS SCALE vs Unraid vs OMV 2026: 5 Factors Compared

In 2026, pick TrueNAS (Community Edition 25.10.7, the former SCALE) if you want ZFS checksums, snapshots and replication built in. Pick OpenMediaVault 8 for a free, lightweight Debian 13 file server that runs in 1 GiB of RAM. Pick Unraid 7.3 if you want to mix drive sizes and will pay $49 to $249 for a license.

These are not minor variations on the same idea. They make different trade-offs about the filesystem, how you grow an array, what hardware they want, and what they cost. Versions and prices below were checked in September 2026.

The one-line summary

• TrueNAS SCALE / Community Edition — integrated OpenZFS storage, snapshots, replication and apps. Plan capacity and redundancy before filling the pool.
• Unraid — a parity array for incremental growth with mixed drive sizes, plus separate storage pools, apps and VMs. Requires a paid licence after the trial.
• OpenMediaVault — a Debian-based file server with filesystem and plugin choices. Consider it when you want to assemble a more modular NAS.

TrueNAS vs Unraid vs OpenMediaVault at a glance

Figures come from each project’s release notes and documentation, linked in the sections below.

OMV vs TrueNAS: which is better?

TrueNAS is better when protecting data comes first: ZFS, snapshots, scrubs and replication ship in every release and are managed from one interface. OpenMediaVault is better when the hardware is small or old, or when you want a plain Debian 13 system you extend with plugins. It runs in 1 GiB of RAM and supports ARM64 boards.

Storage: ZFS by default vs ZFS by plugin

Every TrueNAS pool is OpenZFS, and the 25.10 version notes ship ZFS 2.3 and the Linux 6.12 LTS kernel together. OMV’s core formats ext4, XFS, Btrfs, JFS and F2FS, according to its filesystem documentation, and builds mdadm RAID at levels linear, 0, 1, 10, 5 and 6 per its feature list. The filesystem page adds that ZFS “requires the use of a third party plugin provided by omv-extras.”

The OMV 8 ZFS plugin handles pools, snapshots, scheduled scrubs, encryption and replication from the web UI. It depends on the openmediavault-kernel plugin, and omv-extras recommends the Proxmox kernel because the Debian backports kernel “can lose ZFS module packages across kernel upgrades, causing pools to become inaccessible.” On TrueNAS, keeping ZFS and the kernel in step is the vendor’s job. On OMV it is yours, which is why TrueNAS suits builders who want checksummed storage without assembling plugins, and OMV suits a low-RAM or ARM64 machine run as an ordinary Debian server. The TrueNAS SCALE setup guide walks through a first install.

FreeNAS vs OpenMediaVault: what replaced FreeNAS?

FreeNAS no longer exists under that name. The TrueNAS 12.0 release notes (20 October 2020) record FreeNAS being renamed TrueNAS CORE. CORE is “no longer under active development” and its latest maintenance release is 13.0-U6.8 from July 2025, so FreeNAS vs OpenMediaVault today means TrueNAS Community Edition vs OMV 8.

Older comparisons weighed a FreeBSD appliance with jails against Debian. Current TrueNAS runs Linux with Docker apps, so the real split is the ZFS-first appliance versus the modular Debian file server. If you still run FreeNAS or CORE, move the pool to Community Edition with the CORE to SCALE migration guide, or copy the data to a new OMV build. The SCALE vs CORE comparison covers what staying put costs.

Filesystem and data integrity — the biggest split

This is where the three diverge most.

TrueNAS SCALE is built on OpenZFS. It integrates checksums, copy-on-write, snapshots, compression and replication. Repair requires a valid redundant copy or sufficient parity; checksums alone cannot reconstruct lost data. This integrated management is the reason to shortlist TrueNAS for a NAS centered on ZFS.

Unraid separates its parity-protected array from storage pools. Its checksum and repair behavior depends on the filesystem and redundancy you configure; an array parity check is not equivalent to a ZFS scrub. ZFS pools are also available, so it is inaccurate to say that Unraid can never checksum data.

OpenMediaVault offers Linux filesystems and software RAID, with ZFS and SnapRAID available as omv-extras plugins. Its storage behavior depends on that selection. If Synology is also on your list, the OpenMediaVault, TrueNAS and Synology comparison adds that third option.

For a TrueNAS buyer, the useful question is whether integrated ZFS administration fits the workload. Independent backups remain necessary with any of these platforms.

Array expansion and mixing drives

Unraid’s headline feature: you can add one drive at a time and mix drive sizes freely (the only rule is the parity disk must be at least as large as the largest data disk). For a homelab that grows organically — “I’ll add another disk when I fill up” — this is genuinely excellent and is the main reason people choose Unraid. Dual parity is supported, and Unraid stores each file on a single disk rather than striping it.

TrueNAS SCALE historically grows by adding whole vdevs, and within a vdev disks should match capacity. RAIDZ expansion arrived in TrueNAS 24.10 (29 October 2024): a RAIDZ vdev can grow online one drive at a time and keeps its existing parity level. The planning discipline of ZFS pool design still applies; see our pool design guide and the pool expansion options. If you want to drop in one mismatched disk casually, ZFS resists you.

OMV growth depends on the chosen storage stack. mdadm arrays and ZFS pools follow their own rules; the Unraid-like route pairs the mergerfs plugin, which pools folders under one mount point, with SnapRAID for parity. Decide on that stack before assuming the TrueNAS or Unraid expansion model applies.

OMV vs Unraid: which handles mixed drives better?

Unraid handles mismatched disks more simply: the parity array, dual parity and one web UI come in a single product for $49 to $249. OMV gets close for free with the mergerfs and SnapRAID plugins, but SnapRAID calculates parity only when a sync runs, which suits large media files that rarely change.

SnapRAID shares Unraid’s sizing rule: the omv-extras SnapRAID guide says the parity drive must be at least as large as the largest protected drive, calling it “a hard requirement.” Files written since the last sync have no parity until the next one, so schedule syncs to match how often data changes. Unraid’s Starter tier caps you at 6 attached storage devices; OMV has no license limit.

Apps, containers, and VMs

All three can run apps now, which narrows what used to be a big gap.

• Unraid provides Docker and VM management, with templates through Community Applications.
• TrueNAS SCALE moved to a native Docker app system in the “Electric Eel” generation (24.10, October 2024), replacing the older Kubernetes-based mechanism, so you can deploy catalog apps or paste a Docker Compose file directly. SCALE also runs KVM VMs. See our SCALE apps guide.
• OMV runs Docker through the openmediavault-compose plugin from omv-extras, which manages compose files in the web UI and fills in shared-folder paths and user IDs. The OMV 7 Docker guide advises against Portainer because it disables the compose plugin’s container management. App management is still more DIY than on the other two.

Compare how each platform manages persistent app data and backups before choosing it for self-hosting.

TrueNAS vs Unraid for home media

For Plex or Jellyfin, separate the media library from the application database and temporary transcode files. These have different backup and storage needs even when they live on the same server. A home video collection that cannot be recreated deserves an independent backup; parity in either OS only addresses part of that requirement.

Where the media server stores its data

On TrueNAS, create separate datasets for media and persistent application configuration. Give the app only the access it needs, and use a different policy for disposable transcode cache. The vendor’s Jellyfin storage guidance recommends SSD storage for configuration and cache. Its archived 24.04 screenshots describe the older app system, so use the current catalog for installation fields. The TrueNAS apps guide covers dataset planning for the Docker generation.

Unraid’s share documentation places appdata on a pool for application performance and explains how primary storage, secondary storage and mover settings interact. Keep the database’s intended location explicit instead of assuming every share moves to the array. A media share and an appdata share can use different storage policies.

Direct play and hardware transcoding

Jellyfin documents that transcoding depends on the source format and what the client can play. A compatible client can direct-play media; an unsupported codec or subtitle path can require conversion. Hardware acceleration also depends on supported hardware and configuration. An OS choice alone cannot guarantee a number of simultaneous streams.

On TrueNAS, check an NVIDIA card’s generation first: 25.10 moved to open GPU kernel drivers that support Turing and newer, dropping Pascal, Maxwell and Volta, per the version notes.

List the clients, formats and likely concurrent streams before selecting a CPU or GPU. Budget memory for the media application alongside storage services; the TrueNAS RAM guide separates the operating-system floor from app and VM needs. Keep application configuration in the snapshot and replication plan so a media-server reinstall does not also require rebuilding its database.

Moving an existing library

Choose Unraid when reusing mismatched disks in its array is the priority; choose TrueNAS when you want the integrated ZFS workflow and can plan the vdevs. Switching platforms is a data migration. Do not assume a library can remain on its existing disks while those same disks are reformatted into a new pool. Keep a separate verified copy and plan the restore before changing layouts.

Hardware requirements

• TrueNAS SCALE / ZFS wants RAM. The vendor hardware guide sets the minimum at 8 GB with a 2-core x86_64 CPU and a 16 GB SSD boot device, plus 1 GB per drive beyond eight; 16 GB+ is comfortable, more if you run apps/VMs. ZFS uses RAM for its ARC read cache. See the TrueNAS hardware guide.
• Unraid is comparatively modest; the parity model doesn’t demand ZFS-level RAM unless you opt into ZFS pools. Since Unraid 7.3.0 (12 May 2026) it can boot from a supported internal drive instead of a USB flash drive.
• OMV can suit a modest file server. Its prerequisites allow 1 GiB of RAM but recommend 4 GiB for newcomers and 8 GiB for basic operations, and OMV 8 supports only AMD64 and ARM64. The system drive must be separate from data disks. Add the resources any plugins need, ZFS especially.

Cost

• TrueNAS SCALE — free and open source. No license tiers.
• OpenMediaVault — free and open source. No license tiers.
• Unraid — paid perpetual license. In September 2026 Unraid’s store listed Starter at $49 (up to 6 attached storage devices), Unleashed at $109 and Lifetime at $249 (both unlimited devices). Starter and Unleashed include a year of updates, then an optional $36 annual extension; without it you keep your current version and its patch updates, per the licensing FAQ. The trial lasts 30 days. Confirm current numbers before buying, as pricing changes.

Which one for you

Choose TrueNAS SCALE if data integrity matters most, you can give it the RAM, and you’re willing to plan your pool layout up front. It’s the most “enterprise-grade” of the three at home, and it’s free.

Choose Unraid if you value mixing drive sizes and adding disks one at a time, want the friendliest app/VM experience, and don’t mind paying for a license. It trades ZFS’s integrity guarantees (on the classic array) for unmatched flexibility.

Choose OpenMediaVault if you’re reviving old/low-power hardware, want a free lightweight file server, and don’t need ZFS built in or polished app management. It’s the lean, frugal option.

If the decision includes buying a managed appliance, the Unraid vs Synology comparison covers that separate buying decision. This guide keeps the focus on whether TrueNAS fits your storage and media workload.

Next steps

• TrueNAS SCALE vs CORE in 2026 if you’ve settled on TrueNAS and need to pick the edition.
• ZFS Pool Design: RAIDZ vs Mirrors to plan a SCALE pool before you install.
• The TrueNAS Hardware Guide for sizing RAM and drives.

See also

• Docker homelab tutorials
• mini PC homelab builds

Related across the network

• Unraid iSCSI Target Setup: Plugins, LUNs and CHAP — iscsihub.com
• CMR vs SMR NAS Drives: What Actually Changes — nashardwareguide.com

FAQ

Can OpenMediaVault use ZFS?

Yes, through the openmediavault-zfs plugin from omv-extras rather than the core system. On OMV 8 it manages pools, snapshots, scrubs, encryption and replication from the web UI. It needs the openmediavault-kernel plugin, and omv-extras recommends the Proxmox kernel because Debian backports kernels can lose ZFS modules during kernel upgrades.

Is Unraid a one-time purchase?

Yes. Every Unraid tier is a perpetual license: Starter costs $49 for up to 6 storage devices, Unleashed $109 and Lifetime $249 at September 2026 prices. Starter and Unleashed include one year of updates, then an optional $36 yearly extension; without it you keep your current version and its patch updates.

Is TrueNAS SCALE still called SCALE in 2026?

Mostly not. Since the 25.04 release consolidated CORE and SCALE, the free Linux-based product is called TrueNAS Community Edition, although its documentation paths still say “scale”. The recommended release in September 2026 is 25.10.7 “Goldeye”. TrueNAS 26 is in beta, and CORE, the FreeNAS successor, is no longer under active development.

Can I switch from OpenMediaVault to TrueNAS without wiping my drives?

Usually not. TrueNAS stores data in ZFS pools, so ext4, XFS or mdadm disks from OMV must be copied elsewhere, rebuilt as a pool, then restored. A pool created with OMV’s ZFS plugin is the only realistic candidate for import, and even then keep a verified backup before trying it.