A true microkernel that provides full memory protection is inherently the most stable OS architecture.
Very little code is running in kernel mode that could cause the kernel itself to fail. And individual processes, whether applications or OS services, can be started and stopped dynamically, without jeopardizing system uptime.
QNX Neutrino inherently provides several key features that are well-suited for HA systems:
While any claims regarding “five nines” availability on the part of an OS must be viewed only in the context of the entire hardware/software HA system, one can always ask whether an OS truly has the appropriate underlying architecture capable of supporting HA.