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# SSDFS is a New Linux Filesystem for NVMe ZNS SSDs
- URL: https://itsfoss.com/news/ssdfs-linux-nvme/
- Published: 2023-02-27T11:56:47.000Z
- Updated: 2023-02-27T11:56:47.000Z
- Description: A new filesystem for NVMe ZNS SSDs. Sounds interesting!
- Author: Sourav Rudra
- Tags: Development Updates, News, #Import 2025-11-08 21:15

ZNS stands for 'Zoned Namespaces'; it is a relatively new command set for NVMe SSDs that exposes a zoned block storage interface between the host and the SSD, allowing it to align the data better.

To complement that, a new Linux file system 'SSDFS' has been proposed to be included in the kernel by a developer that **aims to leverage ZNS** for lower I/O latency, reduced write amplification, prolonged SSD lifetime, and more.

Let's take a look at it.

**What is it?:** SSDFS is an open-source, kernel-space [LFS](https://en.wikipedia.org/wiki/Log-structured%5FFile%5FSystem%5F%28BSD%29?ref=itsfoss.com) file system that has been designed to do the following things:

- Eliminate garbage collection (GC) overhead.
- Prolong SSD life.
- Native support for a strict append-only mode, with ZNS SSD & SMR HDD compatibility.
- Guarantee strong reliability and stable performance.

According to the developer, **Viacheslav Dubeyko**. One of SSDFS's key goals is to **decrease the** [**write amplification**](https://en.wikipedia.org/wiki/Write%5Famplification?ref=itsfoss.com) **factor** that causes undesired results in flash memory and SSDs, causing them to fail prematurely.

To achieve this, the concept of **Logical extent will be used** that describes volume extent based on their segment ID, logical block ID, and length.

The SSDFS file system will also **use the** [**b-tree architecture** ](https://en.wikipedia.org/wiki/B-tree?ref=itsfoss.com)to handle the metadata representation. 

(**Technical bit here)** The developer adds that this is because *it provides a compact way to reserve metadata space without the need to use excessive over-provisioning of metadata reservation.*

Viacheslav has also shared some convincing benchmark results that show the capability of SSDFS:

![early benchmark results of the ssdfs file system](https://itsfoss.com/content/images/2023/02/SSDFS_Early_Benchmarks.jpg)

He has also shared the upcoming features for SSDFS, which include:

- IOCTLs support
- Extended Attributes
- Shared Dictionary Functionality
- Deduplication
- Snapshot Support

The developer has mentioned that in its current state, **SSDFS is in a very work-in-progress condition** and is “not completely stable.” 

He also believes “it's time to hear the community opinion.”

If you want to dive deep into SSDFS, you may go through the [patch series](https://lore.kernel.org/linux-fsdevel/20230225010927.813929-1-slava@dubeyko.com/T/?ref=itsfoss.com#m346f5d6ca098f20f18f1ad9f0f304cf3843c0d31) submitted for review.

*💬 What do you think of this? Would you be willing to give this a try?*