# Reliability and Scalability

## Is mergerfs "production ready?"

Yes.

mergerfs has been around for over a decade and used by many users on
their systems. Typically running 24/7 with constant load.

At least a few companies are believed to use mergerfs in production
environments. A number of [NAS focused operating
systems](../related_projects.md) includes mergerfs as a solution for
pooling filesystems.

Most serious issues (crashes or data corruption) have been due to
[kernel bugs](../known_issues_bugs.md#fuse-and-linux-kernel). All of
which are fixed in stable releases.


## How well does mergerfs scale?

Users have reported running mergerfs on everything from OpenWRT
routers and Raspberry Pi SBCs to multi-socket Xeon enterprise servers.

Users have pooled everything from USB thumb drives to enterprise NVME
SSDs to remote filesystems and rclone mounts.

The cost of many calls can be `O(n)` meaning adding more branches to
the pool will increase the cost of certain functions but there are a
number of caches and strategies in place to limit overhead where
possible.