IBM p5 550, Технический обзор и введение

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IBM System p5 550 and 550Q Technical Overview and Introduction
If the output shows CPU Guard as disabled, enter the following command to enable it:
chdev -l sys0 -a cpuguard='enable'
Cache or cache-line deallocation is aimed at performing dynamic reconfiguration to bypass
potentially failing components. This capability is provided for both L2 and L3 caches. Dynamic
runtime deconfiguration is provided if a threshold of L1 or L2 recovered errors is exceeded.
In the case of an L3 cache runtime array single-bit solid error, the spare chip resources are
used to perform a line delete on the failing line.
PCI hot-plug slot fault tracking helps prevent slot errors from causing a system machine
check interrupt and subsequent reboot. This provides superior fault isolation, and the error
affects only the single adapter. Runtime errors on the PCI bus caused by failing adapters
results in recovery action. If this is unsuccessful, the PCI device is shut down gracefully.
Parity errors on the PCI bus itself results in bus retry, and if uncorrected, the bus and any I/O
adapters or devices on that bus are deconfigured.
The p5-550 or p5-550Q support PCI Extended Error Handling (EEH) if it is supported by the
PCI-X adapter. In the past, PCI bus parity errors caused a global machine check interrupt,
which eventually required a system reboot in order to continue. In the p5-550 or p5-550Q
system, hardware, system firmware, and AIX 5L interaction have been designed to allow
transparent recovery of intermittent PCI bus parity errors and graceful transition to the I/O
device available state in the case of a permanent parity error in the PCI bus.
EEH-enabled adapters respond to a special data packet generated from the affected PCI slot
hardware by calling system firmware, which examines the affected bus, allows the device
driver to reset it, and continues without a system reboot.
Persistent deallocation functions include:
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Processor
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Memory
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Deconfigure or bypass failing I/O adapters
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L3 cache
Following a hardware error that has been flagged by the service processor, the subsequent
reboot of the system invokes extended diagnostics. If a processor or L3 cache has been
marked for deconfiguration by persistent processor deallocation, the boot process will attempt
to proceed to completion with the faulty device automatically deconfigured. Failing I/O
adapters will be deconfigured or bypassed during the boot process.
3.1.8 Serviceability
Increasing service productivity means the system is up and running for a longer time. The
p5-550 and p5-550Q improve service productivity by providing the functions that are
described in the following sections.
Error indication and LED indicators
The p5-550 and p5-550Q are designed for client setup of the machine and for the subsequent
addition of most hardware features. The p5-550 and p5-550Q also allow clients to replace
service parts (Client Replaceable Unit). To accomplish this, the p5-550 or p5-550Q provide
Note: The auto-restart (reboot) option, when enabled, can reboot the system automatically
following an unrecoverable software error, software hang, hardware failure, or
environmentally induced failure (such as loss of power supply).