Some components in the Noema are persistent while other components are ephemeral. Noemi don't normally shut down in total. The essence of a Noema is continuous operation where at any one time many individual components are active with other components being inactive. Components that are no longer functioning may be replaced.
To maintain consistency across changes some knowledge is persistent and survives the change. Ideally, these persistent components are replicated so they too can be tolerant to component failure.