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## How to set a port mask using the CLI and GUI 

The command to apply a local FC port mask on CLI is chsystem -localfcportmask mask . The command to apply a remote FC port mask is chsystem -partnerfcportmask mask . 

If you are using the GUI, click Settings →  Network → Fibre Channel Ports . Then you can select the use of a port from these options: 

GLYPH<SM590000> Setting none  means no node-to-node and no replication traffic is allowed. Only host and storage traffic is allowed. 

GLYPH<SM590000> Setting local  means only node-to-node traffic is allowed. 

GLYPH<SM590000> Setting remote  means that only replication traffic is allowed. 

Figure 6-5 shows the port mask in the GUI. 

<img src='content_image/975534.jpg'>

## 6.1.6 Host to I/O group mapping 

An I/O group consists of two IBM SVC nodes or two IBM V7000 node canisters that share management of volumes within a cluster. Use a single I/O group (iogrp) for all volumes that are allocated to a particular host. This guideline has the following benefits: 

GLYPH<SM590000> Minimizes port fan-outs within the SAN fabric 

GLYPH<SM590000> Maximizes the potential host attachments to IBM Spectrum Virtualize because maximums are based on I/O groups 

GLYPH<SM590000> Fewer target ports to manage within the host 

The number of host ports and host objects that are allowed per I/O group depends on the switch fabric type. For more information about the maximum configurations, see V8.2.1 Configuration Limits and Restrictions : 

SVC 8.2.1 Configuration Limits and Restrictions 

V7000 8.2.1 Configuration Limits and Restrictions 

