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HMC network types and configuration:

HMC to managed system (private network):
This is the connection between the HMC and the service processor, which is resposible for the hardware management functions (HMC controls the Power System through the service processor of the managed system)

HMC to logical partition (open network):
This is the connection to all the LPARS and through this connection you can do dynamic LPAR operations and hardware error events can be collected from the LPARs as well.

HMC to remote users:
Remote users can access the HMC in the following ways:
- By using the Web browser to access HMC GUI
- By using SSH to access the HMC command line

HMC to service and support:
You can use this communications path to make automatic service calls. (Transmit data, such as hardware error reports, inventory data, and microcode updates, to
and from your service provider.)


Private and open networks in the HMC environment:

Private networks
The only devices on the HMC private network are the HMC itself and each of the managed systems to which that HMC is connected. The HMC is connected to each managed system's FSP (Flexible Service Processor). On most systems, the FSP provides two Ethernet ports labeled HMC1 and HMC2. This allows you to connect up to two HMCs.

This figure shows a redundant HMC environment with two managed systems. The "blue" HMC is connected to the first port on each FSP, and the "red" (redundant) HMC is connected to the second port. Each HMC is configured as a DHCP server, using a different range of IP addresses. The connections are on separate private networks. As such, it is important to ensure that no FSP port is connected to more than one HMC.

Each managed system's FSP port that is connected to an HMC requires a unique IP address. To ensure that each FSP has a unique IP address, use the HMC's built-in DHCP server capability. When the FSP detects the active network link, it issues a broadcast request to locate a DHCP server. When correctly configured, the HMC responds to that request by allocating one of a selected range of addresses.

(If you have more than one HMC, you must also connect each HMC to the logical partitions, and to each other, on the same open network.)

Open networks
The open (public) network can be connected to a firewall or router for connecting to the Internet. Connecting to the Internet allows the HMC to "call home" when there are any hardware errors that need to be reported.

This figure shows two HMCs connected to a single managed server on the private network and to three logical partitions on the public network.

If you decide to use a private network, use DHCP, and if you will use an open network to manage an FSP, you must set the FSP’s address manually through the Advanced System Management Interface menus. A private, non-routable network is recommended



If this is a new installation, ensure that the managed system is not connected to a power source. If this is a second HMC that is connected to the same managed system, the managed system can be connected to a power source.

1.  Turn on the HMC and wait for the HMC to automatically select the default language and locale preference after 30 seconds.

2.  Accept the Hardware Management Console license agreements and click "Log on and launch the Hardware Management Console web application."

3.  Login with hscroot und default-pw abc123

4.  Launch "Guided Setup Wizard"

5.  Change date/time/timezone

6.  Change default password for hscroot

7.  Configure HMC networks

    eth0 (private network):
    network type = private network
    Speed = default is "Autodetection" (if conn. to a switch, configure it manually: HMC management -> Change network sett. -> LAN Adapter)
    Enable DHCP = specify a DHCP address range
    (You can configure the HMC to be a DHCP server only on a private network)

    eth1 (public network: hmc-admin interface)
    network type = public network
    speed = default is "Autodetection" (if conn. to a switch, configure it manually: HMC management -> Change network sett. -> LAN Adapter)
    setup IP, netmask and gateway

8. Enable firewall-settings for eth1 (in the eth1 dialog-box)
    check or allow the following Services and Ports:
    ssh                         22:tcp
    secure remote web access    443:tcp,8443:tcp,9960:tcp
    RMC                         657:udp,657:tcp

9. Leave all other dialogs unchanged and finish changes made by the Wizard.

10. On the main view click on „HMC-Management“ and do the following:
    Enable „Remote Command execution“
    Enable „Remote Virtual Terminal“
    Enable „Remote Operation“

11. Reboot the HMC (so configuration changes will be available)

12. Login with the new hscroot password

13. Plug network cables into the HMC and check if HMC is answering DHCP request by plugging the cable to your laptop.

Your Ethernet connection to the managed server must be made using the Ethernet port that is defined as eth0 on your HMC.
The HMC supports only one additional Ethernet adapter. If an additional Ethernet adapter is installed, that port is defined as eth0.
In this case, the primary integrated Ethernet port is then defined as eth1, and the secondary integrated Ethernet port ID defined as eth2.
If no adapters are installed, the primary integrated Ethernet port is defined as eth0.


Determining HMC adapter names:

If you set up a DHCP server, that server can operate only on eth0 and eth1.(You might need to determine which adapter to plug the ethernet cable into.)

To determine the name the HMC has assigned to an Ethernet adapter, do the following:
1. Open the restricted shell terminal. Select HMC Management -> Open Restricted Shell Terminal.
2. Type the following at the command line: tail -f /var/log/messages
3. Plug in your Ethernet cable. (If the cable was already plugged in, then unplug it, wait 5 seconds, and plug in the cable again.)
5. You will see a similar output on the console: Aug 28 12:41:20 termite kernel: e1000: eth0: e1000_watchdog: NIC Link is Up 100.
6. Repeat this procedure for all other Ethernet ports, and record your results.
7. Type Ctrl+C to stop thetailcommand.


Testing the connection between the HMC and the managed system:

This option enables you to verify that you are properly connected to the network:
(to test network connectivity, you must be a member of super administrator or service representative)
1. In the Navigation area, click HMC Management.
2. Click Test Network Connectivity.
3. In the Ping tab, type the host name or IP address of any system to which you want to connect. To test an open network, type the gateway.
4. Click Ping.



(If server is cabled with HMC and then started up (and you have waited 5 minutes), but did not show up in HMC, then in ASMI check Network config.)

Important: Do not connect an Ethernet cable to either the HMC1 port or the HMC2 port until you are directed to do so later in this procedure.
Important: If you attach an Ethernet cable to the service processor before the system reaches power off standby, the IP address shown in the Service processor network configuration table might not be valid.

1. If the server is not powered on, plug into the power source.
   (You may need to remove the power supply shipping bracket (if present))

   The system can take several minutes to apply power. When the power cable is connected, the green ac LED on the power supply is lit.
   Wait for the control panel to display 01. A series of progress codes are shown before 01 appears.

2. Select a notebook with a webbrowser, which you will use for connection to the server.

3. Connect an Ethernet cable from notebook to Ethernet port labeled HMC1 on the managed system. (If HMC1 is occupied, connect to HMC2.)

4. This table shows network configuration information for POWER7 service processor:

The Ethernet interface on the notebook needs to be configured within the same subnet mask as the service processor so that they can communicate with each other. For example, if you connected your notebook to HMC1, the IP address for your notebook could be and the subnet mask would be Set the gateway IP address to the same IP address as the notebook

5. To access the ASMI through a Web browser, you first need to set the IP address on your notebook, using the values from the table.
   a. Windows -> Control Panel -> Network -> Local Area Connection (right click) -> Properties -> TCP/IP (v4) -> Properties
   b. Record the current settings before making any changes. This information is needed to restore original settings.
   c. Complete the IP address, Subnet mask, and Default gateway fields by using the values you recorded, from the above table.

6. To access the ASMI using a Web browser:
   a. Determine the IP address of the service processor Ethernet port that your PC or notebook is connected to.
   b. Type the IP address in the Web browser of your notebook: for example, if you connected your notebook to HMC1, type

   Note: It might take up to 2 minutes for the ASMI login display to be shown in the Web browser.
   During this time, if you use control panel function 30 to view the IP addresses on the service processor, not correct data is shown.

7. When the Login display appears, enter "admin" for the user ID and for password "admin" as well.
   You can change now (or not) the default passwords:
   admin        admin
   general        general
   hmcaccess    access

8. You can check if network settings are OK (DHCP should be enabled for eth0 (private network))
   Netw. Services -> Netw. Config. -> IPv4 (continue) -> Make sure type of IP address is set to "Dynamic"

9. Save, close then exit ASMI.


Reconnect a managed system to the HMC:

If your managed system is connected to the HMC, and you disconnect it, before reconnecting it, clear the connection history
on the HMC:
# mksysconn -o auto

If you reconnect the managed system to the HMC without first using this command, HMC will not recognize the Managed System.



  1. hi admin,
    thanks for your sharing experience,
    could you tell me how many managed servers which can be managed by HMC server?


    1. A HMC can manage upto 48 (Managed) non 590-595 servers and 32 590/595 server

  2. Hi Admin,

    Could you please tell me how many maximum LPARs can be supported by a single HMC.

  3. Hi,

    I am facing some issue during installation of V7R7.7.0. At the end of first disc installation, it prompts " please insert disk version 7 disk 1 " ? What does that means?


  4. Hi Admin,

    in point 7, you tell there is a user hmcaccess

    when i connect to ASMI as admin, i can only change password for user HMC, hmcaccess does not exists.

    and so, i can't connect to ASMI with the user HMC, even if i change his password
    I have tried also with user hmcaccess, but the result is the same, i can't connect
    Have you an idea, thanks

  5. Hi Belaz, Can you tell me if this following command (# mksysconn -o auto) will anyway interrupt the existing system already in the managed system. I need to connect a 710 machine in the existing HMC after disconnecting it from a different H

  6. I meant to say "already in the HMC"

  7. i just wondering can we power on single lpar using asmi ascii mode when the hardware already move to another site that didn't have a hmc?

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