Specifications

Chapter 2. Architecture and technical overview 67
Draft Document for Review May 12, 2014 12:46 pm 5102ch02.fm
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.
򐂰 must use different subnets to connect to the service processor.
򐂰 must be able to communicate with the server’s partitions over a public network to allow for
full synchronization and functionality.
Figure 2-26 shows one possible highly available HMC configuration that is managing two
servers. Each HMC is connected to one FSP port of each managed server.
Figure 2-26 Highly available HMC networking example
For simplicity, only the hardware management networks (LAN1 and LAN2) are highly
available (Figure 2-26). However, the open network (LAN3) can be made highly available by
using a similar concept and adding a second network between the partitions and HMCs.
For details about redundant HMCs, see IBM Power Systems HMC Implementation and
Usage Guide, SG24-7491.
2.10 Operating system support
The Power S822 servers support the following operating systems:
򐂰 AIX
򐂰 Linux
In addition, the Virtual I/O Server can be installed in special partitions that provide support to
other partitions running AIX, or Linux operating systems for using features such as virtualized
I/O devices, PowerVM Live Partition Mobility, or PowerVM Active Memory Sharing.
LAN 1 LAN 2
SYSTEM A SYSTEM B
LPAR A1
LPAR A2
LPAR A3
LPAR B1
LPAR B2
LPAR B3
FSPFSP
1 2 1 2
HMC 1
et h 0 eth1
HMC 2
eth0 eth1
LA N 3
LAN 1 - Hardware management
ne two r k fo r first FSP ports (p riva te)
LAN 2 - Hardware management
network for second FSP ports (private),
different network from LAN 1
LAN 3 – Ope n network for HMC a ccess
and DLP AR o pera tions