POWER6 information

Switching ownership of an expansion unit's switchable resources

It may be necessary for the local system to take or release ownership of a switchable resource.

You can use the Take/release ownership option on the Select I/O Debug Function display to have the local system take ownership of a resource or to have the local system release its ownership of a resource. Ownership of a resource indicates which system controls the functions of a resource. Ownership may be released only by the system that presently owns it.

The following procedure will direct you to switch ownership of switchable resources in an expansion unit from the current owner to the alternate system that can own those resources. To perform this procedure, you must know:

The system that currently owns the switchable resources in an expansion unit. This is the system that you are going to release the resources from.
The alternate system that can take ownership of the switchable resources.
The resource name of the high speed link (HSL) I/O bridge resource and the HSL loop number on the currently owning system that will release ownership.
The resource name of the high speed link (HSL) I/O bridge resource and the HSL loop number on the system that will take ownership.

Attention: Perform this procedure only if you are not able to switch the ownership of the resource using the OptiConnect user interface. Cluster Resource Group (CRG) problems may occur as the result of using this procedure when the OptiConnect user interface is available.

Determine the current owner of the switchable resources in the expansion unit if you have not already done so. (See the procedure Determining the power controlling and current logical system ownership of an expansion unit.)
Move to the console of the system that is the current owner of the switchable resources in the expansion unit.
Sign on to System Service Tool (SST) or Dedicated Service Tool (DST).
Select Start a service tool.
Select Hardware Service Manager.
Select Logical Hardware Resources.
Select High speed link resources.
Select the function Include non-reporting resources.
Select Resources associated with loop.
Move the cursor to the HSL I/O bridge resource in the expansion unit. Search for the resource name that the currently owning system assigned to the HSL I/O bridge resource.
Select the I/O Debug option.
When you select the I/O debug option on an HSL I/O bridge that has the capability of being switched, the I/O Debug Function display appears.
From the Select I/O Debug Function display, select the Take/release ownership option. The Confirm Release of Resource Ownership display appears.
Note: If you select option two to release ownership of the resource and another system currently owns it, the following message appears at the bottom of the screen:
Ownership of this resource cannot be released. It is owned by another system.
Record the type-model and the serial number of the HSL I/O bridge resource if you have not already done so.
Press Enter to confirm releasing the resource.
Move to the console of the other system that can take ownership of the switchable resources in the expansion unit.
Sign on to System Service Tool (SST) or Dedicated Service Tool (DST).
Select Start a service tool.
Select Hardware Service Manager.
Select Logical Hardware Resources.
Select High speed link resources.
Select the function Include non-reporting resources.
Move the cursor to the HSL I/O bridge resource in the expansion unit. Search for the resource name that this system assigned to the HSL I/O bridge resource.
Select the I/O Debug option.
From the Select I/O Debug Function display, select the Take/release ownership option. The Confirm Ownership Change display will appear.
Press Enter to confirm the ownership change. This ends the procedure.

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Last updated: Wed, September 28, 2016