OpenMediaVault vs TrueNAS: Plugins, Storage and Upgrades

OpenMediaVault vs TrueNAS comes down to who decides the storage layout. Pick OpenMediaVault 8 if you want a free Debian NAS on AMD64 or ARM64 hardware with your choice of ext4, XFS, Btrfs or ZFS, including mismatched disks. Pick TrueNAS Community Edition if you want ZFS running everything on x86-64 hardware with at least 8 GB of RAM.

Synology is the third answer: an appliance whose hardware and software come from one vendor. FreeNAS is not a fourth contender; it is the old name for TrueNAS, explained below.

OpenMediaVault hands you a Debian system and a web interface over it. TrueNAS hands you an appliance built around ZFS and asks you to accept its opinions in exchange for coherence. A Synology box hands you finished hardware and finished software and asks you to accept both. Each answer has a bill attached, and the bills are paid in different currencies.

The short version

Where OpenMediaVault actually wins

OMV runs on Debian-compatible hardware, but the major version still matters. The OMV 8 release announcement limits supported architectures to AMD64 and ARM64; older 32-bit references in the prerequisites page do not describe OMV 8 support. A compatible desktop, mini PC or ARM64 board can therefore be a target. For the board-specific route, use OpenMediaVault on a Raspberry Pi. The software itself costs nothing: the project is published under GPL-3.0.

The memory floor follows from the same logic. The documentation puts the minimum at 1 GiB while recommending 4 GiB for less experienced administrators and 8 GiB as best practice in dual channel. Nothing about the base system demands more, because the base system is Debian. Memory pressure on an OpenMediaVault box comes from what you add: ZFS, or containers, or both.

Filesystem choice is the second real advantage, and it is underrated. You can run ext4 on a single disk, a union filesystem with scheduled parity across mismatched drives, Btrfs, or a ZFS pool, and the interface manages all of them. That flexibility is exactly what a NAS built from whatever disks you already own needs. The tradeoffs between those layouts are covered in planning an OpenMediaVault NAS.

The underlying Debian tools also help with diagnosis, but OMV manages service configuration. A generic Linux command is not automatically an appropriate persistent fix: make supported changes through the OMV interface and the documentation for its major version.

OMV-Extras plugins: choose the features you need

OMV-Extras is a community plugin repository separate from the core OMV project. Its OMV 8 directory lists Compose, mergerfs, SnapRAID and ZFS integrations. Those entries are different building blocks: mergerfs pools folders into one mountpoint, SnapRAID supplies scheduled parity, and the ZFS plugin brings ZFS management into OMV. Installing the repository does not mean every storage feature is enabled.

For applications, openmediavault-compose exposes Docker Compose in the OMV interface. Compose files and environment files live in a shared folder you select; Docker’s image storage is configured separately. The plugin documentation also defines backup inclusion rules, so a successful backup job does not prove every container volume was included. Follow the OpenMediaVault Docker Compose setup for the folder layout and a restore drill.

Choose plugins by the job they solve and check their OMV 8 documentation before installing. The plugin directory marks some documentation as incomplete or refers readers to an earlier release. That is a reason to verify compatibility before a major upgrade, especially for storage plugins, rather than treating the package list as a promise that every combination is supported.

Filesystem freedom: ext4, XFS, Btrfs or ZFS

The OMV filesystem documentation distinguishes creating, mounting and managing a filesystem. A disk being readable by Linux is not enough to make it available to OMV shared folders: mount it through OMV so its configuration database records the filesystem. The published support table covers ext4, XFS and Btrfs; ZFS is an additional plugin path. These options let you choose storage before choosing the services that publish it.

For a single data disk, ext4 keeps the storage plan small. A mergerfs pool can combine existing filesystem paths, but pooling alone does not provide redundancy. Pairing it with SnapRAID adds parity that reflects the last successful sync. The SnapRAID manual makes sync and recovery separate operations; changing files after a sync changes what that recovery point can protect. That distinction matters for frequently changing container data.

ZFS is an option on OMV, but installing its plugin does not make the host a TrueNAS appliance or convert an existing ext4 disk. Decide whether you want a ZFS workflow before copying data, and budget for a migration if you later change filesystems. The OMV filesystem and shared-folder guide explains the layers without turning this platform comparison into another generic RAID guide.

mergerfs and SnapRAID setup on OMV 8, in order

The OMV 8 pages for both plugins are still marked in progress and point to the OMV 7 guides, which give this sequence:

1. Format and mount every data disk and the parity disk under Storage > File Systems. The SnapRAID plugin guide says the parity drive must be the same size as, or larger than, the largest data drive.
2. Under Storage > mergerfs, create a pool from the data filesystems only. The mergerfs plugin guide shows “Existing Path - Most Free Space” as the preset create policy. Parity drives stay reserved for SnapRAID.
3. Create shared folders on the pool under Storage > Shared Folders.
4. Under Services > SnapRAID, create an array, add each data disk with Content and Data ticked, and add the parity disk with only Parity ticked.
5. Run the first Sync from the Tools menu.
6. In Settings, set the diff thresholds, enable notifications and scrub, then use Schedule Diff to run diff, sync and scrub on a timer.

Where TrueNAS actually wins

TrueNAS is coherent in a way OpenMediaVault is not, because it made one big decision for you: ZFS, everywhere, as the foundation rather than an option. Snapshots, checksums against silent corruption, replication to another pool, and dataset-level properties are all first-class rather than bolted on, and the interface is designed around them instead of accommodating them.

The current release, checked in September 2026, is TrueNAS 25.10.7 “Goldeye”, dated 2 September 2026 in the 25.10 version notes and built on the Linux 6.12 LTS kernel with OpenZFS 2.3. Two changes from 24.10 “Electric Eel” closed old gaps: apps moved to a Docker Compose back end that accepts custom YAML, and RAIDZ pools can be expanded online one drive at a time.

TrueNAS publishes its own hardware guide, including 8 GB memory for basic operations, a 20 GB SSD boot device and any x86-64 Intel or AMD processor. Applications, virtual machines and heavier storage workloads can raise that requirement. If a media server needs an NVIDIA card, 25.10 switched to open GPU kernel drivers for Turing and newer; Pascal, Maxwell and Volta cards are no longer supported. Compare that guidance against the OpenMediaVault system requirements instead of assuming either platform’s minimum is a complete application budget.

The coherence has a boundary. The developer mode page calls TrueNAS “an Open Source Storage appliance, not a standard Linux operating system”, keeps the root filesystem and tools such as apt disabled by default, and withholds support from users who enable developer mode. OMV leaves Debian’s package manager in place, within the limits described above.

Pick TrueNAS when ZFS is the requirement and you want the system built around it rather than configured toward it. Pick OpenMediaVault when ZFS is one option among several, or when the hardware you have will not meet an appliance’s expectations.

What happened to FreeNAS?

FreeNAS is TrueNAS. The 12.0 release notes of 20 October 2020 describe “the unified FreeNAS and TrueNAS release that is renamed to TrueNAS CORE and TrueNAS Enterprise”. CORE, the FreeBSD line, is no longer under active development, so “FreeNAS vs OpenMediaVault” now means TrueNAS Community Edition vs OMV.

The Linux line, SCALE, became TrueNAS Community Edition with 25.04 on 15 April 2025, when CORE entered its maintenance phase. The software status page files CORE 13.0-U6.8 (14 July 2025) and 13.3-U1.2 (29 April 2025) under legacy releases that typically receive no further maintenance, and the download page warns that upgrading from CORE to Community Edition is one-way.

Moving a FreeNAS-era box to OpenMediaVault instead is a migration, not an upgrade: back the data up, install OMV on its own system disk, then restore. Comparisons written in the FreeNAS years describe a FreeBSD system; the TrueNAS you install today is Linux with Docker-based apps.

Where a Synology box actually wins

It wins on the thing neither of the others sells: not having to think about it.

Take the Synology DS223 as a specific example. Its published specification is a four-core Realtek RTD1619B at 1.7 GHz, 2 GB of non-ECC DDR4, two SATA drive bays, one gigabit Ethernet port and three USB 3.2 Gen 1 ports, with Btrfs or ext4 volumes on Basic, JBOD, RAID 0, RAID 1 or Synology Hybrid RAID layouts. These are model specifications, not a benchmark or a recommendation for every Synology NAS. DSM still needs users, shares, backups and updates configured.

The constraints are equally clear and worth stating before you buy rather than after. Memory is fixed at purchase. The network is a single gigabit port, so the arithmetic ceiling of roughly 125 MB/s before overhead applies permanently. The bays are the bays. And the software is the vendor’s, which means the feature set, the app catalogue and the support lifetime are decisions someone else makes and can revise.

Pick the appliance when your time is worth more than the flexibility, or when the NAS has to be usable by someone who will never open a terminal.

TrueNAS vs Synology: which is better?

TrueNAS fits when ZFS snapshots, replication and hardware you choose are the point; Synology fits when the NAS should work out of the box. TrueNAS Community Edition is free but needs your own x86-64 machine with 8 GB of RAM and a boot SSD; a DS223 arrives complete, with 2 GB fixed.

Read any “FreeNAS vs Synology” comparison with the rename in mind: it describes CORE, not the Community Edition you would install now.

Drives. TrueNAS leaves drive choice to you, but its hardware guide advises against USB-connected disks for primary storage and against the RAID function of hardware RAID cards. Synology ties some features to its compatibility list, and on 2025 models M.2 storage pools still depend on it (see the FAQ).

Support. The 25.04 announcement describes Community Edition as “open source, free, community-supported”, so help comes from forums and documentation rather than a vendor ticket.

Debian-release upgrades: the OMV 7 to OMV 8 path

OMV’s release table maps version 7 to Debian 12 and version 8 to Debian 13. It lists OMV 7 as end of life in June 2026. Moving to OMV 8 therefore changes the Debian base as well as the storage management packages.

The OMV 8 announcement names omv-release-upgrade as the OMV 7 upgrade tool. Routine package maintenance is different: OMV’s update documentation describes omv-upgrade for updates within the installed release. Do not substitute a generic edit of Debian repository names for the documented OMV migration path.

Before a release upgrade, verify architecture support, check each installed plugin’s compatibility, make a restorable system backup and independently back up shared data and container state. A 32-bit installation needs a supported replacement installation, not an assumption that a release upgrade changes its architecture. Plan downtime and retain a recovery path until shares and applications work on the new system.

Recovery and application tradeoffs

What happens after a disk fails. Recovery depends on the layout you created. An independent disk has no redundant copy to rebuild; a protected array has the fault tolerance of its chosen layout. OMV’s filesystem flexibility makes documenting that choice part of your recovery plan. None of these platforms removes the need for an independent backup.

Containers. OMV provides the Compose plugin route described above, and TrueNAS has run its apps on Docker Compose since 24.10. On Synology, check the specific model and its supported packages before buying: the DS223 specifications here establish storage hardware, not a universal container-host recommendation.

The number nobody compares. Idle power. A DIY build with six spinning disks and a desktop platform can draw several times what a two-bay appliance draws, every hour, forever. That gap is not visible in any feature table and it does not appear on a spec sheet in a form you can trust, which is why measuring at the wall is worth doing. The OpenMediaVault hardware guide covers the parts of a build where that number is decided.

A decision rule

Choose OpenMediaVault if you already have hardware, if the drives are mismatched sizes, if you want to choose the filesystem yourself, or if your recovery plan is “it is Debian, so the normal answer applies”.

Choose TrueNAS if ZFS is non-negotiable, if snapshots and replication are core to how you work, and if you are willing to buy hardware that suits the appliance rather than making the appliance suit your hardware.

Choose an appliance if the value of never configuring Samba exceeds the value of controlling it, if a two-bay chassis is genuinely enough capacity, and if a fixed 2 GB of memory and a single gigabit port are constraints you can accept for the life of the unit.

If your shortlist also includes Unraid, it is the paid option: $49 for Starter (six devices), $109 for Unleashed or $249 for Lifetime on its pricing page, checked September 2026. OpenMediaVault vs Unraid covers that pairing.

The one answer that is always wrong is picking based on a feature matrix alone. The features overlap heavily. The failure modes do not.

Before you commit

Work out the capacity you need after parity overhead, not before, because the difference between raw and usable is where most first builds go wrong. The OpenMediaVault RAID Capacity Calculator does that arithmetic for a given drive count and protection level, and the answer often changes which of these three options makes sense.

Then check the network side. If the plan is a fast array behind a gigabit link, the link is the ceiling regardless of which system you pick, and slow SMB transfers on OpenMediaVault walks through how to tell the wire, the disks and the protocol apart before spending money on the wrong one.

FAQ

is truenas free

Yes. TrueNAS Community Edition, the current name for what was TrueNAS SCALE, is free and open source, and the download page offers 25.10.7 as the stable release in September 2026. Support is community-based rather than vendor-backed. OpenMediaVault is also free, published under GPL-3.0, so neither choice carries a license fee.

can truenas run on a raspberry pi

No. The TrueNAS hardware guide calls for an x86-64 Intel or AMD processor, so ARM boards such as the Raspberry Pi are out. OpenMediaVault 8 supports ARM64 as well as AMD64, which makes it the usual pick for a Pi NAS, though USB-attached disks and limited memory still shape what the build can do.

can synology use third-party hard drives

Yes, with an exception for M.2. Synology’s DSM 7.3 announcement on 8 October 2025 said 2025 model-year DiskStation Plus, Value and J series running DSM 7.3 support installation and storage pool creation with non-validated third-party drives. M.2 storage pools and cache still require drives on Synology’s compatibility list, so check it before buying NVMe.