AMX Rack Rail Kit MMS Servers Specifications download pdf (Page 112)

4405ch04 Continuous availability and manageability.fmDraft Document for Review September 2, 2008 5:05 pm

98 IBM Power 570 Technical Overview and Introduction

The deallocation event is not successful if the POWER Hypervisor and OS cannot create a

full core equivalent. This result in an error message and the requirement for a system

administrator to take corrective action. In all cases, a log entry is made for each partition that

could use the physical core in question.

POWER6 processor instruction retry

POWER6 processor-based systems include a suite of mainframe-inspired processor

instruction retry features that can significantly reduce situations that could result in checkstop.

Processor instruction retry Automatically retry a failed instruction and continue with

the task.

Alternate processor recovery Interrupt a repeatedly failing instruction and move it to a

new processor and continue with the task.

Partition availability priority Starting with POWER6 technology, partitions receive an

integer rating with the lowest priority partition rated at “0”

and the highest priority partition valued at “255.” The

default value is set at “127” for standard partitions and

“192” for Virtual I/O Server (VIOS) partitions. Partition

Availability Priorities are set for both dedicated and

shared partitions. To initiate Alternate Processor

Recovery when a spare processor is not available, the

POWER Hypervisor uses the Partition availability priority

to identify low priority partitions and keep high priority

partitions running at full capacity.

Processor contained checkstop When all the above mechanisms fail in almost all cases

(excepting the POWER Hypervisor) a termination will be

contained to the single partition using the failing

processor core.

Figure 4-4 Processor instruction retry and Alternate processor recovery

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AMX Rack Rail Kit MMS Servers Specifications Page 112