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PowerHA Geographic mirroring by default automatically selects an open port between 1024 and 65535 on the mirror copy node for receiving data. This port number is selected dynamically selected each and every time replication is started starts, enabling flexibility in a geographic mirroring environment to find an available port.

In some environments, due to Quality of Service (QoS), network restrictions, security, or firewall requirements it is necessary to have applications use specific ports for network activity. Geographic mirroring allows the administrator to specify a port that the geographic mirror copy will use for listening and receiving data.

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1. Only a single port number may can be specified. This port number will be used for all as the data port IP addressesaddress by all nodes in the geographic mirroring environment.

2. This functionality is only supported with clusters containing a single independent auxiliary storage pool (IASP) device in the cluster resource group (CRG). Clusters containing multiple IASP devices have the following additional restrictions:

   1. Each CRG can only have a single IASP device.

   2. Each CRG must use different data port IP addresses.

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1. Select a port number that the mirror copy will use for listening and receiving data. Here, port 12345 is will be used.

2. On every node in the geographic mirroring Cluster Resource Group (CRG), run the following command replacing 12345 with the port selected for the environment:
   ADDSRVTBLE SERVICE(‘geomirror’) PORT(12345) PROTOCOL(‘tcp’)

3. The new port will be used the next time geographic mirroring is resumed. If geographic mirroring is currently active, suspend geographic mirroring and resume geographic mirroring:
   

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