The Data Store cluster requires a continuous heartbeat between nodes within the
isolated VLAN. Without this heartbeat, Data Nodes may potentially go offline, which
increases the risk of the Data Store going down. If you want additional network
redundancy, for planning around switch updates and planned outage, Cisco
recommends that you configure your Data Nodes with port channels for dedicated inter-
Data Node communication. Connect every Data Node to 2 switches, with each physical
port connected to a different switch. See the following diagram for an example:
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deployment.
Data Store Deployment Requirements and Considerations
Place each Data Node so that it can communicate with all of your Flow Collectors, your
SMC, and every other Data Node. For best performance, colocate your Data Nodes and
Flow Collectors to minimize communication latency, and Data Nodes and SMC for
optimum query performance. Cisco highly recommends placing the Data Nodes within
your firewall, such as within a NOC.
If the Data Store goes down due to loss of power or hardware failure, you run an
increased risk of data corruption and data loss. Cisco recommends installing your Data
Nodes with constant uptime in mind.
If a Data Node loses power unexpectedly, and you reboot the appliance, the
database instance on that Data Node may not automatically restart. See
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Data Store Deployment Prerequisites and Recommendations