power on iSeries with only one processor

295 pts.
Tags:
iSeries
iSeries administration
iSeries IPL
iSeries performance
Processors
ih there, my iseries went down last night. It as 2 processor but one is dead. How can i start the system with a single processor. I have HMC. Tanx

Software/Hardware used:
iseries v5r4 power5
ASKED: July 1, 2011  9:22 AM
UPDATED: July 7, 2011  2:38 PM

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<b>If the server firmware detects that a processor is about to fail, or if a processor fails when the processor is not in use, then the server firmware creates a serviceable event. The server firmware can also deconfigure the failing processor automatically, depending upon the type of failure and the deconfiguration policies that you set up using the Advanced System Management Interface (ASMI). You can also deconfigure a failing processor manually using the ASMI. For more information, see Setting deconfiguration policies and Deconfiguring hardware.

When the server firmware deconfigures a failing processor, and there are no unassigned processors available on the managed system, the processor deconfiguration can cause the logical partition to which the processor is assigned to shut down. To avoid shutting down mission-critical workloads when your server firmware deconfigures a failing processor, you can use the Hardware Management Console (HMC) to set partition-availablity priorities for the logical partitions on your managed system. A logical partition with a failing processor can acquire a replacement processor from logical partitions with a lower partition-availability priority. The acquisition of a replacement processor allows the logical partition with the higher partition-availability priority to continue running after a processor failure.

When a processor fails on a high-priority logical partition, the managed system follows these steps to acquire a replacement processor for the high-priority logical partition.

1.If there are unassigned processors on the managed system, the managed system replaces the failed processor with an unassigned processor.
2.If there are no unassigned processors on the managed system, the managed system checks the logical partitions with lower partition-availability priorities, starting with the lowest partition-availability priority.
•If a lower-priority logical partition uses dedicated processors, the managed system shuts down the logical partition and replaces the failed processor with one of the processors from the dedicated-processor partition.
•If a lower-priority logical partition uses shared processors, and removing a whole processor from the logical partition would not cause the logical partition to go below its minimum value, the managed system removes a whole processor from the shared-processor partition using dynamic logical partitioning and replaces the failed processor with the processor that the managed system removed from the shared-processor partition.
•If a lower-priority logical partition uses shared processors, but removing a whole processor from the logical partition would cause the logical partition to go below its minimum value, the managed system skips that logical partition and continues to the logical partition with the next higher partition availability.
3.If the managed system still cannot find a replacement processor, the managed system shuts down as many of the shared-processor partitions as it needs to acquire the replacement processor. The managed system shuts down the shared-processor partitions in partition-availability priority order, starting with the lowest partition-availability priority.
A logical partition can take processors only from logical partitions with lower partition-availability priorities. If all of the logical partitions on your managed system have the same partition-availability priority, then a logical partition can replace a failed processor only if the managed system has unassigned processors.

By default, the partition-availability priority of Virtual I/O Server logical partitions with virtual SCSI adapters is set to 191. The partition-availablity priority of all other logical partitions is set to 127 by default.

Do not set the priority of Virtual I/O Server logical partitions to be lower than the priority of the logical partitions that use the resources on the Virtual I/O Server logical partition. Do not set the priority of i5/OS logical partitions with virtual SCSI adapters to be lower than the priority of the logical partitions that use the resources on the i5/OS logical partition. If the managed system shuts down a logical partition because of its partition-availability priority, all logical partitions that use the resources on that logical partition are also shut down.

If a processor fails when the processor is in use, then the entire managed system shuts down. When a processor failure causes the entire managed system to shut down, the system deconfigures the processor and restarts. The managed system attempts to start the logical partitions that were running at the time of the processor failure with their minimum processor values. If the managed system does not have enough processor resources to start all of the logical partitions with their minimum processor values, then the managed system starts as many logical partitions as it can with their minimum processor values. If there are any processor resources remaining after the managed system has started the logical partitions, then the managed system distributes any remaining processor resources to the running logical partitions in proportion to their desired processor values. </b>

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  • Yorkshireman
    In reverse order, IPL the box Call IBM. before the other one goes.
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  • StevoIBM
    Hi, I am an IBM employee and read over this. Are you looking to replace the downed processor or just migrate your existing vm's onto the remaining processor? As well if you need to get a replacement I can help get the technical resources to help with getting this system fully operational again. You can email me if you have questions and I can help with support. Sversa@ca.ibm.com
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  • Aringarosa
    hi guys, tank you for you time, after all, the problem was in the backplane. Allready installed a new one. Tanks anyway
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