Combining directories from multiple servers on a single mountpoint
SSHFS is a userspace filesystem that allows you to mount a remote filesystem via SFTP over SSH using the FUSE library [1]. It is a very cool concept for a shared filesystem with reasonable security courtesy of SSH. Although the encryption and decryption processes increase CPU usage on both the server and client, a few tuning techniques will bring performance fairly close to NFS [2].
FUSE filesystems are easy to write and maintain compared with kernel-based filesystems, leading to their proliferation. One, SSHFS-MUX [3], builds on SSHFS to allow you to combine directories from different hosts into a single mountpoint (Figure 1). "MUX" is short for multiplexer, which generically allows the device to select one of several input signals and forward it as a single output from the mux.
Figure 1: Combining directory1 from host1 with directory2 from host2 into a single mountpoint on host3 (based on a text diagram from the SSHFS-MUX website).
[...]
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