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There are several problems with existing checkpoint/restore systems. First, except some written-from-scratch process migration operating systems (such as Sprite), they can not preserve opened network connections. Second, general-purpose operating systems such as Unix were not designed to support process migration, so checkpoint/restore systems built on top of existing OSs usually only support a limited set of applications. Third, all systems do not guarantee processes restoration on other side because of resource conflicts (e.g. there can be a process with such PID). OpenVZ gives a unique chance to solve all those problems and to implement full-fledged universal checkpoint/restore system, its intrinsic capability to isolate and to virtualize groups of processes allows to define a self-consistent state essentially for any configurations of containers using all the kinds of resources, which are available inside a container.
