Modes of Operation

A ztC Edge system configured with two nodes allows you to choose from the following modes of VM availability levels of operation, depending on the system model:

Both HA operation and FT operation achieve their respective level of redundancy by using a pair of physical machines (PMs). FT operation consumes more system resources, which could possibly slow processing of applications.

Stratus recommends configuring quorum service for both HA operation and FT operation. The quorum service prevents a condition called split-brain where both PMs of an HA operation and FT operation pair are running independently of each other; for information, see Quorum Servers.