Home > Storage > PowerMax and VMAX > Data Protection > Dell PowerMax and VMAX All Flash: SRDF/Metro Overview and Best Practices > Device pair operation
Once the initial synchronization has completed, the SRDF device pairs then reflect an ActiveActive or ActiveBias pair state and Active SRDF mode. The state of the device pair state depends upon the resiliency options configured for these devices which will be further described in SRDF/Metro resiliency.
SRDF/Metro devices transition to the ActiveActive or ActiveBias SRDF pair states when all the following has occurred:
At this point, the R2 devices with newly federated personalities from the R1 device may then be provisioned to a host or host cluster for use by an application. SRDF/Metro R2 devices should not be provisioned to a host until they enter an ActiveActive or ActiveBias pair state.
Going forward, host writes to either the R1 or R2 are synchronously copied to its paired SRDF device. Should a conflict occur between writes to paired SRDF/Metro devices, the conflict will be internally resolved to ensure a consistent image between paired SRDF/Metro devices is maintained to the individual host or host cluster.