Cluster startup scripts
For startup scripts to work properly, Redis must be configured on each node to automatically save the database on every node, (as described in Configure the cluster).
If you do not do so, and all the nodes go down, it is possible that a node that does not have the most recent data become the primary node when the cluster is restarted. If this happens, the more current data on replica nodes is lost (they purge data that does not match that on the primary). For more information, see section Safety of replication when master has persistence turned off of the Redis replication documentation.