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 enabling starts, offering 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.
Before you Begin
This functionality requires a PTF to be installed on all nodes in the geographic mirroring environment. The required PTF for each release is as follows:
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Release
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PTF
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7.2
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MF67883
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.
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MF67881
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7.4
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Restrictions
Only a single port number
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can be specified. This port number will be used
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as the data port IP
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address by all nodes in the geographic mirroring environment.
This functionality is supported only
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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:
Each CRG can only have a single IASP device.
Each CRG must use different data port IP addresses.
Procedure
Select a port number that the mirror copy will use for listening and receiving data. Here, port
12345
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will be used.
On every node in the geographic mirroring Cluster Resource Group (CRG), run the following command replacing
12345with the port selected for the environment:ADDSRVTBLE SERVICE(‘geomirror’) PORT(12345) PROTOCOL(‘tcp’)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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Geographic mirroring can be suspended with the Change Auxiliary Storage Pool Session (CHGASPSSN) command. Here a session named GEOSSN is used:
Once the session is suspended, resume geographic mirroring to pick up the newly specified port:
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Results
Geographic mirroring will now use the port specified in the service table for geographic mirroring.