What are some alternatives?
When comparing mergerfs and OpenMediaVault, you can also consider the following products
StableBit DrivePool - State of the art, file based drive pooling software.
FreeNAS - FreeNAS is a storage operating system strong and robust enough to meet the needs of enterprise level businesses.
mhddfs - The driver combines a several mount points into the single one.
Rockstor - Rockstor is a free and open source NAS (Network Attached Storage) operating system.
Greyhole - Greyhole is an application that uses Samba to create a storage pool of all your available hard...
Amahi Home Server - Amahi is a media, home and app server software known for its easy-to-use user interface. Amahi has the best media, backup and web apps for small networks.