LPAR Clusters Workspace

 An LPAR Cluster is a collection of z/OS images (logical partitions, or LPARs) that are carved from the resources of a single Central Processing Complex (CPC)  and are part of a single sysplex. Because the LPAR's resources are all derived from a common pool of resources in the CPC, the resources can be redistributed as needed among the LPARs. This permits the operating system's Workload Manager to move resources from LPARs with less important work to LPARs with more important work when that important work is missing its goals.

The LPAR Clusters workspace assists you in answering the following questions:

  1. Do I have important work that is not meeting its performance goals?  Is the reason that this work cannot obtain sufficient processor resource?

  2. Do I have less important work that is meeting or exceeding its service goals? Is the reason that LPARs where this workload is running are obtaining more than their fair share of the processor resource?

This workspace permits you to examine and monitor performance information for the LPARs or clusters associated with a given workload. The workspace contains two charts: the LPAR Logical Utilization (Velocity) chart and the LPAR Physical Utilization chart.  

The LPAR Logical Utilization bar chart graphically shows how well each LPAR is able to obtain CPU resources by charting the Effective Weight Percent (that is, actual) and Logical Weight Percent (target) values for a given LPAR. LPARs that are not accomplishing their target weight show an Effective %Weight bar that is shorter than their Logical %Weight bar. The Effective Weight Index attribute in the CPC LPARs Status report is provided as a measure of this comparison.

The LPAR Physical Utilization bar chart graphically shows, for each LPAR, the Physical CPU Percent Busy (actual utilization)  graphed against the Current Weight Percent (target utilization). Examine this chart to locate those LPARs having a significant discrepancy between the height of the two bars. These LPARs may warrant further examination. A significant discrepancy is not necessarily an indication that there is a performance problem. The CPU Index attribute in the CPC LPARs Status report is provided as a measure of this comparison.

Tables in this workspace provide information about CPC Status, LPAR Cluster information, and CPC LPARs Status. The first two tables provide CPC and Cluster summary information. The CPC LPARs Status table provides detailed performance information for the LPARs that are configured on the CPC.  

The CPC LPARs Status table has the following predefined thresholds set:

From the LPAR Cluster table, you can link to the LPARs Assigned to a Cluster workspace.

See also:

Organization of system-level predefined workspaces
Attribute groups used by system-level predefined workspaces