Savvy Linux users can provide SAN services to physical, virtual, and containerized applications without buying a SAN product, by using LinBit open-source software based on DRDB, which is included in the Linux distribution.
LINBIT provides support for DRBD in a similar way to how Red Hat supports its Linux distro and has four downloadable products on its website: a DRBD Linux kernel driver, DRDB Windows driver, LINSTOR cluster-wide volume manager and, in tech preview form, LINBIT VSAN for VMware. The core product is DRDB, a Distributed Replicated Block Device for Linux.
Read more about this at blocksandfiles.com