High Availability Hmc Configuration - IBM Power Systems E870 Technical Overview And Introduction

Draft Document for Review October 14, 2014 10:19 am
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 using the ASMI menus.
Notes: The two service processor HMC ports have the following features:
Run at a speed of 100 Mbps
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 2.5.2, "Service Processor Bus" on
page 67.

2.11.4 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).
To achieve HMC redundancy for a POWER8 processor-based server, the server must be
connected to two HMCs:
The HMCs must be running the same level of HMC code.
The HMCs must use different subnets to connect to the service processor.
The HMCs must be able to communicate with the server's partitions over a public network
to allow for full synchronization and functionality.
Chapter 2. Architecture and technical overview
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