What are some alternatives?
When comparing Zentyal and mhddfs, you can also consider the following products
ClearOS - A very good alternative for Windows Server, for free
StableBit DrivePool - State of the art, file based drive pooling software.
OpenMediaVault - OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.
Drive Bender - Drive Bender, class leading storage pooling technology
NethServer - NethServer is an operating system for Linux enthusiasts, designed for small offices and medium...
mergerfs - mergerfs is a union filesystem geared towards simplifing storage and management of files across...