DV Consulting is a registered Linbit partner.
We sell support licenses and provide consulting services to DRBD and Pacemaker High Availability solutions. You can read more about Linbit's products here
Here High Availability is explained based on Linbit's open source cluster stack:
Linbit's cluster stack provides possibility to create a geo-cluster based on open source components:
Contact us if you want to know more about geo-clustering and DRBD proxy.