I want to have the HDDs in the NAS as separate volumes (to not loose all data when a single HDD fails; I don't need any protection like RAID; on the other hand, with JBOD or SHR I would loose data from all HDDs when only one fails). It means that they are mounted as separate devices into separate mount points. However, I want to share all the data as a single shared folder.
The only solution I found is mhddfs package which I have been using on a normal linux machine for a long time. However, how can I get it into the Synology NAS?