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Guardian
Learn how Guardian provides comprehensive asset inventory and network visibility for OT and IoT environments.
Installation Guide
Information and resources on how to install Guardian, and the different options and settings that are available.
Virtual installation
Check the RAM of a virtual machine
The amount of random-access memory (RAM) from the hypervisor might not correspond with the actual amount seen from within the virtual machine (VM). Therefore, it is important to confirm that your VM has sufficient RAM to support your configuration.

Guardian
Learn how Guardian provides comprehensive asset inventory and network visibility for OT and IoT environments.
- Introduction
  An overview of Guardian.
- Installation Guide
  Information and resources on how to install Guardian, and the different options and settings that are available.
  - Introduction
  - Physical installation
  - Virtual installation
    - Virtual Guardian installation
      Before you install a virtual machine (VM), you should make sure that you are familiar with the minimum requirements, and the supported formats and software that you can use with the Nozomi Networks software products.
    - Virtual machine sizing
      A description of the virtual machine (VM) sizing requirements for Nozomi Networks sensors.
    - Minimum Guardian sizing requirements
      The following table gives recommended sizes for instances running the Guardian.
    - Check the CPU of a virtual machine
      The amount of central processing units (CPU) from the hypervisor might not correspond with the actual amount seen from within the virtual machine (VM). Therefore, it is important to confirm that your VM has sufficient CPUs to support your configuration.
    - Check the RAM of a virtual machine
      The amount of random-access memory (RAM) from the hypervisor might not correspond with the actual amount seen from within the virtual machine (VM). Therefore, it is important to confirm that your VM has sufficient RAM to support your configuration.
    - Install a virtual machine
      Install the Guardian sensor on a virtual machine using a supported OVA or VHD file format. Ensure your system meets the minimum requirements and the hypervisor is properly configured. This setup enables centralized network monitoring in a virtualized environment.
    - Expand a disk on a virtual machine
      The monitoring scope of your sensor will dictate the size requirements of your virtual hard drive. Do this procedure to adjust the size of the virtual hard drive.
    - Add a secondary disk to a virtual machine
      If the main disk is not large enough when it is first imported, you can do this procedure to add a larger virtual data disk to the virtual machine (VM).
    - Add a monitoring interface to the virtual machine
      By default, the virtual machine (VM) has one management network interface and one monitoring interface. Depending on deployment needs, it might be useful to add more monitoring interfaces to the sensor.
    - Cloud deployment
  - Container installation
  - Basic configuration
  - Additional settings
  - Compatibility Reference
  - Federal Information Processing Standards
- Administrator Guide
  Information and resources about the Administration section of Guardian, and the tasks that you can do in this part of the software.
- User Guide
  Information and resources about the main features of Guardian, and the tasks that you can do from the user interface (UI).
- Maintenance Guide
  Information about the maintenance tasks of Guardian, to help you administer and maintain the solution in a production environment.
- Print format documentation
  A list of all the print-format documentation that is available for Guardian.

Check the RAM of a virtual machine

The amount of random-access memory (RAM) from the hypervisor might not correspond with the actual amount seen from within the virtual machine (VM). Therefore, it is important to confirm that your VM has sufficient RAM to support your configuration.

About this task

Important:

random-access memory (RAM) and central processing unit (CPU) resources must be configured in accordance with the intended usage. Before deployment, verify your sizing requirements in this documentation.

Procedure

Open a terminal.
Enter this command:
```
sysctl hw.physmem
```
The terminal will show the physical memory of the virtual machine (VM).
If the memory is insufficient for your configuration, use the Minimum Guardian sizing requirements table to identify the correct amount of RAM that you need.
To confirm that the CPU allocation in the hypervisor matches your sizing requirements for the intended deployment, see Check the CPU of a virtual machine.