IBM Power 780 Technical Overview And Introduction page 122

Figure 2-38 shows one possible highly available HMC configuration that is managing two
servers. These servers have only one CEC and therefore only one FSP. Each HMC is
connected to one FSP port of all managed servers.
Figure 2-38 Highly available HMC and network architecture
Note that for simplicity, only hardware management networks (LAN1 and LAN2) are highly
available (Figure 2-38). However, the management network (LAN3) can be made
highly available by using a similar concept and adding more Ethernet adapters to LPARs
and HMCs.
Both HMCs must be on a separate virtual local area network (VLAN) to protect from any
network contention. Each HMC can be a DHCP server for its VLAN.
Redundant service processor connectivity
For the Power 770 and Power 780 with two or more CECs, two redundant service processors
are installed in CEC enclosures 1 and 2. Redundant service processor function requires that
each HMC must be attached to one Ethernet port in CEC enclosure 1 and one Ethernet port
in CEC enclosure 2.
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IBM Power 770 and 780 (9117-MMD, 9179-MHD) Technical Overview and Introduction
HMC1 HMC2
LAN 1 LAN 2
1 2 1 2
FSP FSP
System A System B
LPAR A1 LPAR B1
LPAR A2 LPAR B2
LPAR A3 LPAR B3
LAN3 – Open network
LAN1 – Hardware management network for
first FSP ports (private)
LAN2 – Hardware management network for
second FSP ports (private), separate
network hardware from LAN1
LAN3 – Open network for HMC access and
dLPAR operations