4405ch04 Continuous availability and manageability.fmDraft Document for Review September 2, 2008 5:05 pm
96 IBM Power 570 Technical Overview and Introduction
action to deconfigure the faulty hardware, helping to avoid a potential system outage and to
enhance system availability.
Persistent deallocation
To enhance system availability, a component that is identified for deallocation or
deconfiguration on a POWER6 processor-based system is flagged for persistent deallocation.
Component removal can occur either dynamically (while the system is running) or at
boot-time (IPL), depending both on the type of fault and when the fault is detected.
In addition, runtime unrecoverable hardware faults can be deconfigured from the system after
the first occurrence. The system can be rebooted immediately after failure and resume
operation on the remaining stable hardware. This prevents the same faulty hardware from
affecting system operation again, while the repair action is deferred to a more convenient,
less critical time.
Persistent deallocation functions include:
Processor
Memory
Deconfigure or bypass failing I/O adapters
L2, L3 cache
Figure 4-2 ASMI Auto Power Restart setting
Dynamic processor deallocation
Dynamic processor deallocation enables automatic deconfiguration of processor cores when
patterns of recoverable errors, for example correctable errors on processor caches, are
detected. Dynamic processor deallocation prevents a recoverable error from escalating to an
Note: The auto-restart (reboot) option has to be enabled from the Advanced System
Manager Interface or from the Operator Panel.
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