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IBM Power System E850C: Technical Overview and Introduction
In POWER8 processor-based systems, the external I/O hub and bridge adapters were
eliminated in favor of a topology that integrates PCIe Host Bridges into the processor module
itself. PCIe busses that are generated directly from a host bridge can drive individual I/O slots
or a PCIe switch. The integrated PCIe controller supports try again (end-point error recovery)
and freezing.
IBM device drivers under AIX are fully EEH-capable. For Linux under PowerVM, EEH support
extends to many frequently used devices. There might be third-party PCI devices that do not
provide native EEH support.
4.3.12 Remote Restart capability
The Power E850C server supports logical partitions that are capable of remote restarting.
This option can be enabled for each partition individually. If a host system fails, the workload
of the host system can be automatically restarted on an operational target system. To recover
from unexpected failures and to improve the availability of the systems, workloads are
restarted automatically.
The HMC can restart an AIX or Linux partition remotely if the partition supports an attribute
called
encapsulated state
. An encapsulated state partition is a partition in which the
configuration information and the persistent data are stored external to the server on
persistent storage.
This capability requires that an HMC manage the host system and the operational target
system. The Remote Restart capability requires that the following requirements are met:
The server supports the remote restart capability. This is the case for the Power E850C.
The partition must not have physical I/O adapters that are assigned to the partition.
The partition must not be a full system partition, or a Virtual I/O Server.
The partition must not be an alternative error-logging partition.
The partition must not have a barrier synchronization register (BSR).
The partition must not have huge pages (applicable only if PowerVM Active Memory
Sharing is enabled).
The partition must not have its rootvg volume group on a logical volume or have any
exported optical devices.
Remote Restart can be enabled for applicable partitions through the HMC interface.
4.4 Availability impacts of a solution architecture
A solution should not rely only on the hardware platform. Despite IBM Power Systems having
superior RAS features to other comparable systems, design a redundant architecture for the
application to allow for easier maintenance tasks and greater flexibility.
When running in a redundant architecture, some tasks that would otherwise require that a
application be brought offline, can now be executed with the application running, allowing for
even greater availability.
Summary of Contents for E850C
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