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Figure 2-32 shows a simple network configuration to enable the connection from the HMC to
the server and to allow for dynamic LPAR operations. For more information about HMC and
the possible network connections, see IBM Power Systems HMC Implementation and Usage
Guide, SG24-7491.
Hardware appliance HMC
Virtual appliance HMC
Figure 2-32 Network connections from the HMC to service processor and LPARs
By default, the service processor HMC ports are configured for dynamic IP address
allocation. The HMC can be configured as a DHCP server, providing an IP address at the
time that the managed server is powered on. In this case, the FSP is allocated an IP address
from a set of address ranges that are predefined in the HMC software.
If the service processor of the managed server does not receive a DHCP reply before
timeout, predefined IP addresses are set up on both ports. Static IP address allocation is also
an option and can be configured by using the ASMI menus.
Notes: The two service processor HMC ports have the following features:
Run at a speed of 1 Gbps
Are visible only to the service processor and can be used to attach the server to an
HMC or to access the ASMI options from a client directly from a client web browser
Use the following network configuration if no IP addresses are set:
– Service processor eth0 (HMC1 port): 169.254.2.147 with netmask 255.255.255.0
– Service processor eth1 (HMC2 port): 169.254.3.147 with netmask 255.255.255.0
For more information about the service processor, see 4.5.3, "Service processor" on
page 117.
2.13.5 High availability HMC configuration
The HMC is an important hardware component. Although Power Systems servers and their
hosted partitions can continue to operate when the managing HMC becomes unavailable,
certain operations, such as dynamic LPAR, partition migration using PowerVM Live Partition
Mobility, or the creation of a new partition, cannot be performed without the HMC. To avoid
such situations, consider installing a second HMC in a redundant configuration, to be
available when the other is not (during maintenance, for example).
eth1
eth0
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eth1
eth0
Management LAN
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HMC1
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Service
Processor
HMC2
Power Systems server
Chapter 2. Architecture and technical overview
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