How MergerFS and NFS Can Pool Local and Remote Storage Without a Full Cluster

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A technical guide explains how to combine MergerFS, a union filesystem, with NFS to merge local disk and remote network storage into a single mount point on Linux. The setup uses two machines: one acting as an NFS storage server and another as a client that merges the NFS share with its own local disk using MergerFS. Applications on the client see only one unified storage pool, with MergerFS handling file placement across branches based on configured policies. The approach is designed for homelab or self-hosted environments where simpler alternatives to full clustering tools like Ceph or GlusterFS are preferred. The guide also notes key limitations, including unsuitability for multi-writer workloads or high-availability needs, and emphasizes that a union filesystem is not a substitute for a backup.

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