Chapter 2. Architecture and technical overview 73
Draft Document for Review May 28, 2009 1:59 pm 4405ch02 Architecture and technical overview.fm
HMC Ethernet IP addresses have been assigned, it is possible to download the Web-based
System Manager Remote Client from a web browser, using the following URL:
http://HMC_IP_address/remote_client.html
You can then use the PC to access other HMCs remotely. Web-based System Manager
Remote Clients can be present in private and open networks. You can perform most
management tasks using the Web-based System Manager Remote Client. The remote HMC
and the Web-based System Manager Remote Client allow you the flexibility to access your
managed systems (including HMCs) from multiple locations using multiple HMCs.
For more detailed information about the use of the HMC, refer to the IBM Systems Hardware
Information Center.
Open Firmware
A System p6 server has one instance of Open Firmware both when in the partitioned
environment and when running as a full system partition. Open Firmware has access to all
devices and data in the server. Open Firmware is started when the server goes through a
power-on reset. Open Firmware, which runs in addition to the POWER Hypervisor in a
partitioned environment, runs in two modes: global and partition. Each mode of Open
Firmware shares the same firmware binary that is stored in the flash memory.
In a partitioned environment, Open Firmware runs on top of the global Open Firmware
instance. The partition Open Firmware is started when a partition is activated. Each partition
has its own instance of Open Firmware and has access to all the devices assigned to that
partition. However, each instance of Open Firmware has no access to devices outside of the
partition in which it runs. Partition firmware resides within the partition memory and is
replaced when AIX or Linux takes control. Partition firmware is needed only for the time that is
necessary to load AIX or Linux into the partition server memory.
The global Open Firmware environment includes the partition manager component. That
component is an application in the global Open Firmware that establishes partitions and their
corresponding resources (such as CPU, memory, and I/O slots), which are defined in partition
profiles. The partition manager manages the operational partitioning transactions. It responds
to commands from the service processor external command interface that originates in the
application running on the HMC. The ASMI can be accessed during boot time or using the
ASMI and selecting the boot to Open Firmware prompt.
For more information about Open Firmware, refer to Partitioning Implementations for IBM
eServer Partitioning Implementations for IBM Eserver p5 Servers, SG24-7039, which is
available at:
http://www.redbooks.ibm.com/abstracts/sg247039.html
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