Lets say I got a fast (connection) but low-storage server (S1) and a slow but much-storage server (S2). Is it (practically) possible to use the server S1 as a "proxy" for files? I.e. there is a folder "huge files" on S1, where the files actually get written to S2 (no problem so far with a mount) and also conserve user permissions. So - for example - if "User 1" writes "File 1" into the "huge files" folder, "User 2" can read but not modify it.
Note: S1 is accessed via SFTP, as it seemed like the best solution for filetransfer via www. Note 2: Both S1 and S2 run linux/ubuntu)
For security only S1 should be allowed to connect to S2