Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

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Remote Replication requirements and restrictions

To use the standard Remote Replication premium feature, you must have:

Two storage arrays with write access and both these storage arrays must have sufficient space to replicate data between them.
Each storage must have a dual-controller Fibre Channel or iSCSI configuration (single-controller configurations are not supported).
Fibre Channel Connection Requirements — You must attach dedicated remote replication ports to a Fibre Channel fabric environment. In addition, these ports must support the Name Service.
You can use a fabric configuration that is dedicated solely to the remote replication ports on each RAID controller module. In this case, host systems can connect to the storage arrays using fabric.
Fibre Channel Arbitrated Loop (FC-AL), or point-to-point configurations, are not supported for array-to-array communications.
Maximum distance between the local site and remote site is 10 km (6.2 miles), using single-mode fibre Gigabit interface converters (GBICs) and optical long-wave GBICs.
iSCSI connection considerations:
- iSCSI does not require dedicated ports for replication data traffic
- iSCSI array-to-array communication must use a host-connected port (not the Ethernet management port).
- The first port that successfully establishes an iSCSI connection is used for all subsequent communication with that remote storage array. If that connection subsequently fails, a new session is attempted using any available ports.