An everRun system provides two modes of operation to set user-defined availability levels for VMs:
Both HA operation and FT operation achieve their respective level of redundancy by using a pair of physical machines (PMs).
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.
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