---
title: "Virtual Machines. Right-sizing – VMs Undersized for Memory and CPU"
description: "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..."
canonical: "https://helpcenter.veeam.com/docs/mp/vmware_guide/vms_rightsizing_undersized.html"
breadcrumb: "Veeam MP for VMware User Guides > Operations Guide > Reports > Veeam VMware Analysis Reports > Virtual Machines. Right-sizing – VMs Undersized for Memory and CPU"
dateModified: "2026-09-08"
---

# 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.

::: note

This report assumes desired 25% headroom on top of any peak of VM usage. Consider this when evaluating the results of this report.

:::

## Example Output

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:

1. From the **From** list, select *This month* > *First day*. From the **To** list, select *Today*.
2. From the **Sections to Show** list, select both *vRAM* and *vCPU*.
3. From the **Show Details** list, select *Yes (collapsed)*.
4. From the **Performance Modeling Based On** list, select *Average Usage*.
5. In the **Top N Count** field, enter *10*.
6. Click **Run** to view the report.

[![Right-sizing – VMs Undersized for Memory and CPU Report Settings](images/undersized_vms_controls.png "Right-sizing – VMs Undersized for Memory and CPU Report Settings")](images/undersized_vms_controls.png){.toggle scale=65}

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.

  [![Right-sizing – VMs Undersized for Memory and CPU Report Output for RAM](images/undersized_vms_cpu.png "Right-sizing – VMs Undersized for Memory and CPU Report Output for RAM")](images/undersized_vms_cpu.png){.toggle scale=63}

- Virtual machines that have not enough RAM allocated

  [![Right-sizing – VMs Undersized for Memory and CPU Report Output for vCPU](images/undersized_vms_ram.png "Right-sizing – VMs Undersized for Memory and CPU Report Output for vCPU")](images/undersized_vms_ram.png){.toggle scale=63}

You can click the plus sign next to any virtual machine name in the table to view details for that virtual machine.

[![Right-sizing – VMs Undersized for Memory and CPU Report Output Details](images/undersized_vms_chart.png "Right-sizing – VMs Undersized for Memory and CPU Report Output Details")](images/undersized_vms_chart.png){.toggle scale=64}

The **Recommendations** analysis sections for both vCPU and vRAM will summarize the total savings possible by reclaiming the resources found by the report.

::: note

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:

[![RAM Analysis](images/ram_recommendations_undersized.png "RAM Analysis")](images/ram_recommendations_undersized.png){.toggle scale=63}

CPU Analysis recommendation table:

[![CPU Analysis](images/cpu_recommendations_undersized.png "CPU Analysis")](images/cpu_recommendations_undersized.png){.toggle scale=63}

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.