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PowerFlex cluster is deployed on minimum four node PowerFlex appliance. In RHOSP cinder driver is configured with PowerFlex details. Cinder communicates with PowerFlex using the PowerFlex Gateway storage IP provided in custom cinder configuration file. This allows user to create and consume PowerFlex volume.
For complete information about deployment and network configurations, see Deploy Dell EMC PowerFlex v3.5.x and Dell EMC PowerFlex: Networking Best Practices and Design Considerations.