## 10.6.3 IP partnership limitations 

The following prerequisites and assumptions must be considered before IP partnership between two IBM Spectrum Virtualize systems can be established: 

GLYPH<SM590000> The IBM SAN Volume Controller or IBM Storwize systems are successfully installed with V7.2 or later code levels. 

GLYPH<SM590000> The 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. 

GLYPH<SM590000> The storage SANs are configured correctly and the correct infrastructure to support the Spectrum Virtualize systems in remote copy partnerships over IP links is in place. 

GLYPH<SM590000> The two systems must be able to ping each other and perform the discovery. 

GLYPH<SM590000> The 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). 

GLYPH<SM590000> Only a single partnership over IP is supported. 

GLYPH<SM590000> A 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. 

GLYPH<SM590000> IP 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. 

GLYPH<SM590000> The maximum supported round-trip time is 80 milliseconds (ms) for 1 Gbps links. 

GLYPH<SM590000> The maximum supported round-trip time is 10 ms for 10 Gbps links. 

GLYPH<SM590000> The minimum supported link bandwidth is 10 Mbps. 

GLYPH<SM590000> The inter-cluster heartbeat traffic uses 1 Mbps per link. 

GLYPH<SM590000> Only nodes from two I/O Groups can have ports that are configured for an IP partnership. 

GLYPH<SM590000> Migrations of remote copy relationships directly from FC-based partnerships to IP partnerships are not supported. 

GLYPH<SM590000> IP partnerships between the two systems can be over IPv4 or IPv6 only, but not both. 

GLYPH<SM590000> Virtual LAN (VLAN) tagging of the IP addresses that are configured for remote copy is supported starting with V7.4.0. 

GLYPH<SM590000> Management IP and Internet SCSI (iSCSI) IP on the same port can be in a different network starting with V7.4.0. 

GLYPH<SM590000> An added layer of security is provided by using Challenge Handshake Authentication Protocol (CHAP) authentication. 

GLYPH<SM590000> Transmission Control Protocol (TCP) ports 3260 and 3265 are used for IP partnership communications. Therefore, these ports must be open in firewalls between the systems. 

GLYPH<SM590000> Only a single Remote Copy (RC) data session per physical link can be established. It is intended that only one connection (for sending/receiving RC data) is made for each independent physical link between the systems. 

