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Chapter 4. Continuous availability and manageability
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4.3.1 Service environments
The IBM POWER5 and POWER6 processor platforms support three main service
environments:
Servers that do not include a Hardware Management Console (HMC). This is the
manufacturing default configuration for from two operational environments:
– Standalone full system partition: The server can be configured with a single partition
that owns all server resources and has only one operating system installed.
– Non-HMC partitioned system: For selected Power Systems servers, the optional
PowerVM feature includes Integrated Virtualization Manager (IVM), which is a
browser-based system interface for managing servers without an attached HMC.
Multiple logical partitions can be created, each with its own operating environment. All
I/O is virtualized and shared.
An analogous feature, the Virtual Partition Manager (VPM), is included with IBM i (5.3
and later), and supports the needs of small and medium clients who want to add simple
Linux workloads to their System i5 or Power server. The VPM introduces the capability
to create and manage Linux partitions without the use of the HMC. With the VPM, a
server can support one i partition and up to four Linux partitions. The Linux partitions
must use virtual I/O resources that are owned by the i partition.
Server configurations that include attachment to one or multiple HMCs. This is the default
configuration for high-end systems and servers supporting logical partitions with dedicated
I/O. In this case, all servers have at least one logical partition.
Mixed environments of POWER6 and POWER5 processor-based systems controlled by
one or multiple HMCs for POWER6 technologies. This HMC can simultaneously manage
POWER6 and POWER5 process-based systems. An HMC for a POWER5 process-based
server, with a firmware upgrade, can support this environment.
4.3.2 Service processor
The service processor is a separately powered microprocessor, separate from the main
instruction processing complex. The serv selected remote power control, environmental
monitoring, reset and boot features, remote maintenance and diagnostic activities, including
console mirroring. On systems without a HMC, the service processor can place calls to report
surveillance failures with the P and critical processing faults even when the main processing
unit is inoperable. The service processor provides services common to modern computers
such as:
Environmental monitoring
– The service processor monitors the server’s built-in temperature sensors, sending
instructions to the system fans to increase rotational speed when the ambient
temperature is above the normal operating range.
– Using an architected operating system interface, the service processor notifies the
operating system of potential environmental related problems (for example, air
conditioning and air circulation around the system) so that the system administrator
can take appropriate corrective actions before a critical failure threshold is reached.
– The service processor can also post a warning and initiate an orderly system shutdown
for a variety of other conditions:
• When the operating temperature exceeds the critical level (for example failure of air
conditioning or air circulation around the system).