How to Resolve Number of Virtual Devices Exceeds the Maximum for a Given Controller

If you use a virtualization platform such as VMware or VirtualBox, you may encounter an error message that says “Number of virtual devices exceeds the maximum for a given controller”. This error occurs when you try to add more virtual disks or other virtual devices to a virtual machine than the controller can support. In this guide, we will show you how to fix this error.

Step 1: Check the Maximum Number of Virtual Devices

The first step is to check the maximum number of virtual devices that your virtualization platform supports for each controller. You can usually find this information in the documentation or online support resources for your platform.

For example, in VMware, you can check the maximum number of virtual devices for a SCSI controller by right-clicking the virtual machine in the inventory, selecting “Edit Settings”, and then selecting the SCSI controller in the “Hardware” tab. The maximum number of devices is shown in the “Device Limit” field.

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Step 2: Remove Unused Virtual Devices

If you have exceeded the maximum number of virtual devices, you will need to remove some unused devices before you can add more. You can do this by right-clicking the virtual machine in the inventory, selecting “Edit Settings”, and then selecting the device you want to remove in the “Hardware” tab. Click the “Remove” button to remove the device.

Step 3: Add a New Controller

If you need to add more virtual devices than the current controller supports, you can add a new controller. For example, in VMware, you can add a new SCSI controller by right-clicking the virtual machine in the inventory, selecting “Edit Settings”, and then clicking the “Add” button. Select “SCSI Controller” and click “Next”. Choose a new SCSI controller type and click “Next”. Enter a new SCSI bus number and click “Next”. Finally, choose the maximum number of devices you want to support and click “Finish”.

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Step 4: Add Virtual Devices to the New Controller

Once you have added a new controller, you can add virtual devices to it. For example, in VMware, you can add a new virtual disk by right-clicking the virtual machine in the inventory, selecting “Edit Settings”, and then selecting the new SCSI controller in the “Hardware” tab. Click the “Add” button and select “Hard Disk”. Choose a disk type, size, and location, and then click “Next” and “Finish”.

Conclusion

In this guide, we have shown you how to fix the “Number of virtual devices exceeds the maximum for a given controller” error in a virtualization platform such as VMware or VirtualBox. By checking the maximum number of virtual devices, removing unused devices, and adding a new controller if necessary, you can increase the number of virtual devices supported by your virtual machine. We hope this guide has been helpful to you. If you have any comments or suggestions for improvements, please feel free to share them below.

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