TrueNAS Just Skipped a Version Number. Meet TrueNAS 27 RC.1.

Every so often, a software project does something small that tells you a lot about where it is going. This week, iXsystems did exactly that: it shipped the first release candidate of the next major TrueNAS, and announced that the version everyone has been beta testing as TrueNAS 26 is now called TrueNAS 27. The rename is the headline, but the release underneath it is the story that matters for the thousands of homelabs running the storage operating system. RC.1, released October 6, brings Linux kernel 6.18 LTS, OpenZFS 2.4, and a genuinely interesting set of new features, with the stable TrueNAS 27.0 release scheduled for early December.

The version number change came from the community. The logic, as iXsystems tells it, is simple: most people will deploy this release during 2027 and run it well beyond that, so the version should match the year of use rather than the year of release. The company reached for the car-model-year analogy, where the 2027 model arrives on dealer lots in the fall of 2026. The change also simplified the whole numbering scheme. TrueNAS previously used a year-and-month format (25.10, 25.04, 24.10, and so on), which stopped telling you anything useful once the project moved to one major release a year. Going forward, each major release carries a single yearly number (TrueNAS 27 now, TrueNAS 28 next), and dot releases are purely sequential instead of being tied to a month.

There is a practical angle to the rename that goes beyond marketing. Version numbers are often the first thing a security review or audit looks at, and iXsystems noted that Linux has had more than 7,000 kernel CVEs published in 2026 alone. A version number that lines up with the year a system is actually running gives administrators a clearer signal during procurement and compliance checks. Finalizing the name at the release-candidate stage means documentation, upgrade paths, and support conversations never have to translate between two different names, which is a welcome bit of foresight.

A new foundation: Linux 6.18 LTS and OpenZFS 2.4

The kernel and storage stack updates are the backbone of this release. Linux 6.18 LTS brings support for newer controllers, network devices, and chipsets, which matters directly to homelab builders who are constantly adding bargain hardware to their racks. For a storage-focused OS, kernel updates also carry power management and efficiency improvements that reduce the ongoing cost of keeping a server on around the clock. OpenZFS 2.4, meanwhile, advances AVX2 optimization for checksum and compression workloads, which pays off most on systems doing repeated large reads and writes. That combination of newer hardware support and faster storage internals is the classic reason to care about a major NAS OS release, and it is all here.

TrueSearch and WebShare bring the NAS closer to how you actually use files

Two headline features suggest TrueNAS is thinking about the NAS as more than a place to park data. TrueSearch adds server-side search, so users can find files in large datasets without pulling everything down to the client first, a meaningful difference when your photo archive has grown to terabytes. WebShare is a new sharing system for external file exchange and internal publishing, designed to work alongside permission management so that opening up a share does not mean opening up everything. The trend is clear: storage systems are absorbing search and sharing as core functions rather than leaving them to add-on apps, and administrators get stricter control over what is visible while users stop caring where data lives. That is a direction worth watching.

TrueNAS 27 keeps doing what it does best: making enterprise-grade storage boring, reliable, and yours.

Fusion Pools 2.0, SMB failover, and an early S3 object interface

The rest of the RC.1 feature set rounds out the enterprise story. Fusion Pools 2.0 advances the mixing of fast NVMe flash and high-capacity spinning drives, letting frequently used data sit on the fast tier while bulk storage stays cheap, which is exactly the cost-versus-speed tradeoff home users with mixed drive collections face. Stateful SMB failover improves availability for Windows-based sharing by preserving connection state when a node fails over, a feature that used to be firmly in enterprise-only territory. And the TrueNAS Object Interface arrives as early access, letting applications reach ZFS datasets directly through the S3 protocol. Blurring the line between file storage and object storage on a single box is a quiet but significant shift: it means the same pool that holds your SMB shares could one day serve backups and applications speaking the cloud's native language.

What to do with RC.1: test on spare gear, wait for December for real data

Release candidates exist for one reason, and it is testing. If you have a spare drive, a test VM, or a lab NAS with backups you can afford to rebuild, RC.1 is a valuable chance to validate your hardware against Linux 6.18 and OpenZFS 2.4 before the December stable release. Check your share settings, user permissions, and pool configurations migrate cleanly. Then wait. TrueNAS 27.0, the stable release, is scheduled for early December 2026, and the schedule is unchanged by the rename. For the NAS that holds your actual photos, documents, and media library, the correct move is to let the community find the remaining bugs, read the release notes carefully, snapshot everything, and upgrade in December. TrueNAS earned its reputation by being the boring, reliable layer under people's digital lives. TrueNAS 27 keeps that promise, now with a version number that finally admits it will be living with you in 2027.