Cisco Stealthwatch Hardware Deployment And Configuration Manual page 8

Data Store Concepts and Architecture
If a node goes down, as long as the node containing its backup is still available, and at
least half of your total number of Data Nodes are still up, the overall Data Store remains
up. This allows you time to repair the downed connection or faulty hardware; after you
replace the faulty Data Node, the Data Store restores that node's data from the existing
backup stored on the adjacent Data Node, and creates a backup of data on that Data
Node. See the following diagram for an example of how Data Nodes store telemetry:
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