PetaSAN is described as 'open source Scale-Out SAN solution offering massive scalability and performance. PetaSAN uses modern cloud based technologies to provide the elasticity and agility to scale up the storage cluster simply by adding more nodes'. There are more than 10 alternatives to PetaSAN for a variety of platforms, including Linux, Self-Hosted solutions, VMware vSphere Hypervisor, BSD and SUSE Linux Enterprise. The best alternative is TrueNAS, which is both free and Open Source. Other great apps like PetaSAN are Unraid (Paid), XigmaNAS (Free, Open Source), StorPool (Paid) and ReadyNAS (Paid).
TrueNAS (formerly FreeNAS) is an operating system that can be installed on virtually any hardware platform to share data over a network. TrueNAS is the simplest way to create a centralized and easily accessible place for your data.
An operating system for personal and small business use that brings enterprise-class features letting you configure your computer systems to maximize performance and capacity using any combination of applications, VMs, storage devices, and hardware.
StorPool is an intelligent software-defined storage solution that allows service providers, enterprises and other Cloud builders to run data storage on standard x86 servers, instead of on expensive and inefficient storage arrays (SANs).
ReadyNAS OS ReadyNAS OS is based from Linux and is exclusive for the ReadyNAS products and can be controlled by web address (example 192.168.0.20) and has many features like app support (Plex, PHP, etc) ReadyNAS Desktop Series
Open-E Data Storage Software V7 SOHO (Small Office Home Office) is a free version of Open-E DSS V7, previously known as Open-E DSS V7 Lite. With SOHO, you can take advantage of basic functionalities of our fully featured NAS / SAN software platform
It uses openSUSE Leap as a base with the Btrfs advanced file system. EasyNAS is managed through a web-based interface and offers such features as on-line growing of file systems, snapshots and copy-on-write.
Dell EMC UnityVSA lets you deploy Dell EMC Unity unified storage as a virtual storage appliance. Dell EMC UnityVSA is software-defined storage that runs on industry-standard hardware and VMware ESXi, which you supply.