Can I make it to only write to a specific path?

[parasiteoflife]

I have multiple locations that I want to merge but I want them to be read-only (/loc1, /loc2, /loc3), since programs will want to write files to the contents of these directories I want to add an additional rw path (/loc4) so all writes go to this one path.

If I understood correctly I should put /loc4 first in the order and use ff, but does that ensures the other paths won't be written to? Like if /loc4 gets full or the file to write is bigger than /loc4's free space, will the operation error or will the file be placed on any of the other paths?

To be clear no path is mounted in the OS as read-only.

Thanks.

[trapexit]

https://trapexit.github.io/mergerfs/latest/config/branches/#branch-mode

You don't forbid writing. You forbid creation.

[parasiteoflife]

thank you! in OMV I would add =RO at the end of each path, right?

[trapexit]

I don't own, maintain, or use OMV so I really can't say if or how to do it. Sorry.

[parasiteoflife]

Oh, sorry, I must have misremembered. Thought it was said in the forums you were also the maintainer of the plugin.