IBM SY44-5902-05 manual Switching ownership of a tower’s switchable resources

Switching ownership of a tower’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 a tower from the current owner to the alternate system that can own those resources. To perform this procedure, you must know:

vThe system that currently owns the switchable resources in a tower. This is the system that you are going to release the resources from.

vThe alternate system that can take ownership of the switchable resources.

vThe 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.

vThe 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 HSL OptiConnect user interface. Cluster Resource Group (CRG) problems may occur as the result of using this procedure when the HSL OptiConnect user interface is available.

1.Determine the current owner of the switchable resources in the tower if you have not already done so. (See the procedure “Determining the power controlling system of a tower” on page 150.)

2.Move to the console of the system that is the current owner of the switchable resources in the tower.

3.Sign on to System Service Tool (SST) or Dedicated Service Tool (DST).

4.Select Start a service tool.

5.Select Hardware Service Manager.

6.Select Logical Hardware Resources.

7.Select High speed link resources.

8.Select the function Include non-reporting resources.

9.Move the cursor to the HSL I/O bridge resource in the tower. Search for the resource name that the currently owning system assigned to the HSL I/O bridge resource.

10.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 following screen is displayed:

154Service Functions V5R2