5137ch02.fm
Draft Document for Review October 14, 2014 10:19 am
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IBM Power Systems E870 and E880 Technical Overview and Introduction
2.11.3 HMC connectivity to the POWER8 processor-based systems
POWER8 processor-based servers, and their predecessor systems, that are managed by an
HMC require Ethernet connectivity between the HMC and the server’s service processor. In
addition, if dynamic LPAR, Live Partition Mobility, or PowerVM Active Memory Sharing
operations are required on the managed partitions, Ethernet connectivity is needed between
these partitions and the HMC. A minimum of two Ethernet ports are needed on the HMC to
provide such connectivity.
For the HMC to communicate properly with the managed server, eth0 of the HMC must be
connected to either the HMC1 or HMC2 ports of the managed server, although other network
configurations are possible. You may attach a second HMC to the remaining HMC port of the
server for redundancy. The two HMC ports must be addressed by two separate subnets.
Figure 2-39 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.
Figure 2-39 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 flexible service processor (FSP)
is allocated an IP address from a set of address ranges that are predefined in the HMC
software.
RAID 1
Default
Default
Multitech internal modem
Optional
None
USB ports
Two front, four back, one internal
Two front, four back, one internal
Integrated network
Four 1 Gb Ethernet
Four 1 Gb Ethernet
I/O slots
One PCI Express 3.0 slot
One PCI Express 3.0 slot
Feature
CR7
CR8
Power Systems server
LPAR
n
LPAR
...
LPAR
2
LPAR
1
entx
entx
entx
entx
Service
Processor
HMC2
eth0
HMC1
eth1
Management LAN
HMC