The VMRM (VM Resource Manager) performance goal specifies the percentage
of CPU and IO resources for a group of virtual machines in a z/VM. By setting
the VMRM properties, you set a VMRM goal for Linux guest systems
in a server complex and, thus, configure the VMRM to maintain that performance
goal.
You can specify these VMRM goals for each tier separately or specify
a common goal for all the
Linux guest systems
in the server complex.
A VMRM goal is considered valid if and only if
both:
- The Importance field is specified
- Either the CPU or DASD field is specified.
Complete the following
steps to edit
the VMRM configuration domain:
- If it is not started already, start the Server Complexes
task for the z/VM system you want to work with.
- Select the server complex for which you want to set the VMRM goals.
- Click Action → Edit Properties to open the Server
Complex Properties window and click the VMRM tab to display the VMRM
page.
- Choose whether the configuration target is the entire server complex
or a specific tier.
- If you chose the Specific tier radio button, choose the
desired tier. The properties of the selected tier are displayed.
- In the CPU field, type the VMRM CPU velocity goal. This
is a value from 1 to 100.
- In the DASD field, type the VMRM DASD (direct access storage
device) velocity goal (IO priority). This is a value from 1 to 100.
- In the Importance field, type the VMRM importance of the
goal. This is a value from 1 to 10. The Linux guest system with
the higher relative value will take precedence in the case of a conflict over
resources. Goals with a higher importance value will have higher priority
when being maintained by VMRM.
- Click OK to apply the modified settings to the
Linux guest systems currently in the server complex. If you modified settings in any of the other
domains (except for the Scripts domain), these are also applied to the Linux
guest systems in the server complex. Before applying the modified properties, the Server
Complexes task runs a consistency check against the old properties.
- The Progress Indication window shows the progress of the
action. If there is an inconsistency, you are given a choice whether to proceed
or stop. Stopping saves the new properties but doesn't apply the configuration.
After the operation is completed, click Close to close the Progress
Indication window.
Note: For
further information on VMRM, see z/VM 5.1 Performance (SC24-6109-00),
chapter 17, "VMRM SVM Tuning Parameters".