Virtual Machines. Right-sizing – VMs Undersized for Memory and CPU
This report helps you detect virtual machines that have less allocated vRAM or vCPU resources than they require. The report analyzes historical performance and configured resource allocation to provide recommendations for an optimized VM configuration and allocation of resources.
This report assumes desired 25% headroom on top of any peak of VM usage. Consider this when evaluating the results of this report.
In this example, the report allows you to detect top 10 VMs that have less allocated memory and CPU resources than they require. Performance statistics for the last month were used as a basis for the report analysis.
To run this report:
- From the From list, select This month > First day. From the To list, select Today.
- From the Sections to Show list, select both vRAM and vCPU.
- From the Show Details list, select Yes (collapsed).
- From the Performance Modeling Based On list, select Average Usage.
- In the Top N Count field, enter 10.
- Click Run to view the report.
The report will show tables and charts displaying information on top 10 VMs memory and CPU consumption: allocated, recommended, min/max and average memory values, standard deviation and current configuration.
The report contains two sections:
- Virtual machines that have not enough vCPUs allocated.
- Virtual machines that have not enough RAM allocated
You can click the plus sign next to any virtual machine name in the table to view details for that virtual machine.
The Recommendations analysis sections for both vCPU and vRAM will summarize the total savings possible by reclaiming the resources found by the report.
All recommendations are based on the current configuration. So, if a virtual machine has no current configuration (is turned off or decommissioned), it will not be included in the report.
RAM Analysis recommendation table:
CPU Analysis recommendation table:
You can click the name of an undersized VM or the Undersized VMs link in the RAM analysis and CPU analysis tables to drill down to performance details for these VMs.
You can also scroll down to see performance details for the VMs that cannot be analyzed.