550 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
With native IP partnership, the following Copy Services features are supported:
/SM590000Metro Mirror
Referred to as synchronous replication, MM provides a consistent copy of a source 
volume on a target volume. Data is written to the target volume synchronously after it is 
written to the source volume so that the copy is continuously updated. 
/SM590000Global Mirror and GM with Change Volumes
Referred to as asynchronous replication, GM provides a consistent copy of a source 
volume on a target volume. Data is written to the target volume asynchronously so that the 
copy is continuously updated. However, the copy might not contain the last few updates if 
a DR operation is performed. An added extension to GM is GM with Change Volumes. GM 
with Change Volumes is the preferred method for use with native IP replication.
11.8.2  IP partnership limitations
The following prerequisites and assumptions must be considered before IP partnership 
between two IBM Spectrum Virtualize systems can be established:
/SM590000The IBM Spectrum Virtualize systems are successfully installed with V7.2 or later code 
levels.
/SM590000The systems must have the necessary licenses that enable remote copy partnerships to 
be configured between two systems. No separate license is required to enable IP 
partnership.
/SM590000The storage SANs are configured correctly and the correct infrastructure to support the 
IBM Spectrum Virtualize systems in remote copy partnerships over IP links is in place.
/SM590000The two systems must be able to ping each other and perform the discovery.
/SM590000TCP ports 3260 and 3265 are used by systems for IP partnership communications. 
Therefore, these ports need to be open.
/SM590000The maximum number of partnerships between the local and remote systems, including 
both IP and FC partnerships, is limited to the current maximum that is supported, which is 
three partnerships (four systems total). 
/SM590000Only a single partnership over IP is supported. 
/SM590000A system can have simultaneous partnerships over FC and IP, but with separate systems. 
The FC zones between two systems must be removed before an IP partnership is 
configured.
/SM590000IP partnerships are supported on both 10 gigabits per second (Gbps) links and 1 Gbps 
links. However, the intermix of both on a single link is not supported.
/SM590000The maximum supported round-trip time is 80 milliseconds (ms) for 1 Gbps links.
/SM590000The maximum supported round-trip time is 10 ms for 10 Gbps links.
/SM590000The inter-cluster heartbeat traffic uses 1 Mbps per link.
/SM590000Only nodes from two I/O Groups can have ports that are configured for an IP partnership.
/SM590000Migrations of remote copy relationships directly from FC-based partnerships to IP 
partnerships are not supported.
Note: For IP partnerships, generally use the Global Mirror with change Volumes 
method of copying (asynchronous copy of changed grains only). This method can have 
performance benefits. Also, Global Mirror and Metro Mirror might be more susceptible 
to the loss of synchronization.