Edit VM compute resources#

You might need to increase the compute resources if the OS data indicates that the currently allocated resources are insufficient or if you believe that the amount of allocated CPU or RAM is a performance bottleneck.

If you have excess compute capacity, you can reduce compute resources to save money.

Before you begin#

Before you begin, ensure that you:

  • Determine the type of compute resource change you want to make.

  • Understand that the change you want to make might have pay-as-you-go billing implications.

How to get started#

Complete the following steps to begin editing VM compute resources:

  1. Log in to the Rackspace Services for VMware Cloud portal.

  2. Click Data Centers and select the VDC that contains the VM you want to edit.

  3. From the Compute drop-down menu, click Virtual Machines and then click the VM you want to edit.

  4. Click Compute and then click the top Edit button.

Best practice guidelines#

Consider the following guidelines when you edit VM compute resources.

Field name

Guidelines

Placement policy

This feature is currently disabled.

Sizing policy

Select from a pre-defined list of VM sizes.

Number of virtual CPUs

The number of virtual CPUs is a function of the sizing policy you selected.

Calculate the virtual CPU value by multiplying the number of sockets by the number of cores per socket.

Cores per socket

The number of cores per socket is a function of the sizing policy you selected.

Having more cores means your VM can independently run more applications or threads.

Number of sockets

The number of sockets is a function of the sizing policy you selected.

You cannot directly change this setting.

Virtual CPU hot add

The CPU hot-add feature enables you to add CPU resources to a running VM.

Before you enable CPU hot add, ensure that:

  • The guest OS supports hot add.

  • You install the latest release of VMware tools.

  • You power off the VM.

Expose hardware-assisted CPU virtualization to guest OS

This setting allows exposure of the full CPU virtualization to the guest operating system so that applications that require hardware virtualization can run on VMs without binary translation or paravirtualization.

Memory

The amount of memory is a function of the sizing policy you selected.

You cannot directly change this setting.

Memory hot add

The memory hot-add feature enables you to add memory resources to a running VM.

Before you enable memory hot add, ensure that:

  • The guest OS supports hot add.

  • You install the latest release of VMware tools.

  • You power off the VM.