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+Forces a node to save the `nodes.conf` configuration on disk. Before to return
+the command calls `fsync(2)` in order to make sure the configuration is flushed
+on the computer disk.
+
+This command is mainly used in the event a `nodes.conf` node state file gets
+lost / deleted for some reason, and we want to generate it again from scratch.
+It can also be useful in case of mundane alterations of a node cluster
+configuration via the `CLUSTER` command in order to ensure the new configuration
+is persisted on disk, however all the commands should normally be able to auto
+schedule to persist the configuration on disk when it is important to do so for
+the correctness of the system in the event of a restart.
+
+@return
+
+@simple-string-reply: `OK` or an error if the operation fails.