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:
- What is the reason that this work cannot obtain sufficient processor
resource?
- 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 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 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 Status table also contains information about
model capacity IDs and capacity ratings. The default positioning of
the capacity columns is at the end of the columns displayed in the CPC Status view. If you deploy Capacity Provisioning
Manager or On/Off Capacity on Demand, consider reorganizing the sequence
of columns so that these columns appear closer to the beginning of
the column sequence.
Note:
Some LPARs cannot easily
be associated with a cluster. These are collected under the umbrella
cluster labeled "N/A". Some LPAR attributes may not be available
or may not apply to one of more of these LPARs. And since "N/A" is
not a real cluster, it is not included in the LPARs
Clusters view.
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:
- If LPAR Name not equal to “PHYSICAL” and Effective Weight
Index equal to 0.9, you will see a
warning
indicator
- If LPAR Name not equal to “PHYSICAL” and Effective Weight
Index less than 0.9, you will see a
critical
indicator
From the LPAR Cluster table, you can link
to the LPARs Assigned to a Cluster workspace.
From the CPC Status table, you can link to
the OMEGAMON for MVS - LPAR PR/SM Processor
Statistics workspace.
Related topics: