Greyhole is described as 'Application that uses Samba to create a storage pool of all your available hard drives (whatever their size, however they're connected), and allows you to create redundant copies of the files you store, in order to prevent data loss when part of your hardware' and is an app. There are eight alternatives to Greyhole for Linux, Windows, BSD and FreeBSD. The best Greyhole alternative is Unraid. It's not free, so if you're looking for a free alternative, you could try OpenZFS or btrfs. Other great apps like Greyhole are StableBit DrivePool, mergerfs, EON ZFS Storage and Drive Bender.
Flexible operating system combining storage management with support for mixed drive sizes, Docker containers, virtual machines, hardware and GPU passthrough, browser-based interface, file protocols, scalable expansion, integrated parity, and monitoring features.
OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.
Btrfs is a modern copy on write (CoW) filesystem for Linux aimed at implementing advanced features while also focusing on fault tolerance, repair and easy administration.
mergerfs is a union filesystem geared towards simplifing storage and management of files across numerous commodity storage devices. It is similar to mhddfs, unionfs, and aufs.
What is EON? Embedded Operating system/Networking is a small operating system, built on Solaris, designed to store any amount of digital data on Intel/AMD (x86) hardware, using the amazing, enterprise class Zettabyte File System.
Why use EON? Because it offers rock solid, reliab.
Drive Bender for Windows is state of the art, single point storage pool technology for all versions of Microsoft Windows (read more).
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