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1. DRBD
Distributed Replicated Block Device (DRBD) mirrors block devices between multiple hosts. The replication is transparent to other applications on the host systems. Any block device hard disks, partitions, RAID devices, logical volumes, etc can be mirrored.
To get started using drbd, first install the necessary packages. From a terminal enter:
sudo apt install drbd8-utils
If you are using the virtual kernel as part of a virtual machine you will need to manually compile the drbd module. It may be easier to install the linux-server package inside the virtual machine.
This section covers setting up a drbd to replicate a separate /srv partition, with an ext3 filesystem between two hosts. The partition size is not particularly relevant, but both partitions need to be the same size.