Another benefit of isolating remote application traffic on dedicated ports is to ensure that  problems that affect the cluster-to-cluster interconnect do not adversely affect ports on the  primary cluster. Adversely affected ports can deteriorate the performance of workloads that  are running on the primary cluster. IBM suggests the port designations that are shown in Figure 9-5 for isolating port-to-local and  port-to-remote node traffic for the 2145-SV1 nodes. (Other port configurations might apply for  iSCSI and FCoE connectivity.)  Notes:  Consider the following points regarding Figure 9-5: This suggestion provides the traffic isolation that you want while also simplifying migration  from existing configurations with only four ports, or even later migrating from 8-port, 12-port,  or 16-port configurations to configurations with more ports.  More complicated port mapping configurations that spread the port traffic across the adapters  are supported and can be considered. However, these approaches do not appreciably  increase the availability of the solution because the mean time between failures (MTBF) of the  adapter is not significantly less than the MTBF of the non-redundant node components. Although alternative port mappings that spread traffic across HBAs might allow adapters  to come back online following a failure, they do not prevent a node from going offline  temporarily to restart and attempt to isolate the failed adapter and then, rejoin the cluster.  Our suggestion takes all of these considerations into account with a view that the greater  complexity might lead to migration challenges in the future and the simpler approach is best. Chapter 9. Product integration  353 GLYPH<SM590000> These options represent optimal configurations that are based on port assignment to  function. The use of the same port assignment but different physical locations does not  result in any significant performance effect in most client environments. GLYPH<SM590000> Use caution when zoning so that inter-node ports are not used for Host/Storage in the  8-, 12-, and 16-port configurations. GLYPH<SM590000> SAN column assumes an odd/even SAN port configuration. Modifications must be  made if other SAN connection schemes are used. Figure 9-5 Port designations recommendations for isolating traffic on 2145-SV1 nodes