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However, by using the embedded IP replication, this behavior can be eliminated with the enhanced parallelism of the data flow by using multiple virtual connections (VC) that share IP links and addresses. The artificial intelligence engine can dynamically adjust the number of VCs, receive window size, and packet size to maintain optimum performance. While the engine is waiting for one VC’s ACK, it sends more packets across other VCs. If packets are lost from any VC, data is automatically retransmitted, as shown in Figure 11-96. 

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For more information about this technology, see IBM Storwize V7000 and SANSlide Implementation , REDP-5023. 

With native IP partnership, the following Copy Services features are supported: 

GLYPH<SM590000> Metro 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. 

GLYPH<SM590000> Global 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. 

