Editing Single system image (section)

===Process checkpointing===
Some SSI systems allow [[Application checkpointing|checkpointing]] of running processes, allowing their current state to be saved and reloaded at a later date.<ref group="note">Checkpointing is particularly useful in clusters used for [[high-performance computing]], avoiding lost work in case of a cluster or node restart.</ref>
Checkpointing can be seen as related to migration, as migrating a process from one node to another can be implemented by first checkpointing the process, then restarting it on another node.  Alternatively checkpointing can be considered as ''migration to disk''.