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.  526  Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.2.1