Manual Chapter : Introduction to the vCMP System

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  • 11.4.1
Manual Chapter

What is vCMP?

Virtual Clustered Multiprocessing (vCMP) is a feature of the BIG-IP system that allows you to provision and manage multiple, hosted instances of the BIG-IP software on a single hardware device. A vCMP hypervisor allocates a dedicated amount of CPU, memory, and storage to each BIG-IP instance. As a vCMP system administrator, you can create BIG-IP instances and then delegate the management of the BIG-IP software within each instance to individual administrators.

A key part of the vCMP system is its built-in flexible resource allocation feature. With flexible resource allocation, you can instruct the hypervisor to allocate a different amount of resource to each BIG-IP instance according to the particular needs of each instance. The hypervisor provides these resources to BIG-IP instances in the form of cores, which contain a portion of system CPU and memory.

At a high level, the vCMP system includes two main components:

vCMP host
The vCMP host is the system-wide hypervisor that makes it possible for you to create and view BIG-IP instances, known as guests. Through the vCMP host, you can also manage guest properties. For each guest, the vCMP host allocates system resources according to the particular resource needs of the guest.
vCMP guests
A vCMP guest is an instance of the BIG-IP software that you create on the vCMP system for the purpose of provisioning one or more BIG-IP modules to process application traffic. A guest consists of a TMOS instance, plus one or more BIG-IP modules. Each guest has its own share of hardware resources that the vCMP host allocates to the guest, as well as its own management IP addresses, self IP addresses, virtual servers, and so on. This effectively allows each guest to function as a separate BIG-IP device, configured to receive and process application traffic, with no knowledge of other guests on the system. Furthermore, each guest can use TMOS features such as route domains and administrative partitions to create its own multi-tenant configuration. Each guest requires its own guest administrator to provision, configure, and manage BIG-IP modules within the guest. Depending on the hardware model, a vCMP system can support up to approximately six guests.

This illustration shows a basic vCMP system with a host and four guests. Note that each guest a different set of modules provisioned, depending on the guest's particular traffic requirements.

A vCMP system with four guests Example of a four-guest vCMP system

Other vCMP system components

In addition to the host and guests, the vCMP system includes these components:

Virtual disk
A virtual disk is an amount of disk space that the system has allocated to a guest (typically 100 gigabytes). Each virtual disk is implemented as an image file with an .img extension, such as guest_A.img.
A core is a portion of CPU and memory that the vCMP host allocates to a guest. The amount of CPU and memory that a core provides varies by hardware platform.

Network isolation

The vCMP system separates the data plane network from the management network. That is, the host operates with the hardware switch fabric to control the guest data plane traffic. This provides true multi-tenancy by ensuring that traffic for a guest remains separate from all other guest traffic on the system.

The following illustration shows the separation of the data plane network from the management network.

Isolation of the data plane network from the management network Isolation of the data plane network from the management network

About vCMP system administration

Administering a vCMP system requires two distinct types of administrators: a vCMP host administrator who manages the host to create trunks and VLANs, create guests, and allocate resources to those guests, and a vCMP guest administrator who provisions and configures BIG-IP modules within a specific guest.

On a vCMP system, the administrative user accounts, roles, and associated access control mechanisms of a vCMP host are separate from those of the guests. This prevents a user from accessing the host or other guests on the system, thereby ensuring the separation of administrative tasks across the vCMP deployment.

After you initially set up the vCMP host, you will have a standalone, multi-tenant vCMP system with some number of guests defined. A guest administrator will then be ready to provision and configure the BIG-IP modules within a guest to process application traffic.

Optionally, if the host administrator has set up a second system with equivalent guests, a guest administrator can configure high availability for any two equivalent guests.

BIG-IP license considerations for vCMP

The BIG-IP system license authorizes you to provision the vCMP feature and create guests with one or more BIG-IP system modules provisioned. Note the following considerations:

  • Each guest inherits the license of the vCMP host.
  • The host license must include all BIG-IP modules that are to be provisioned across all guest instances. Examples of BIG-IP modules are BIG-IP Local Traffic Manager and BIG-IP Global Traffic Manager.
  • The license allows you to deploy the maximum number of guests that the platform allows.

You activate the BIG-IP system license when you initially set up the vCMP host.

vCMP provisioning

To enable the vCMP feature, you perform two levels of provisioning. First, you provision the vCMP feature as a whole. When you do this, the BIG-IP system, by default, dedicates most of the disk space to running the vCMP feature, and in the process, creates the host portion of the vCMP system. Second, once you have configured the host to create the guests, each guest administrator logs in to the relevant guest and provisions the required BIG-IP modules. In this way, each guest can run a different combination of modules. For example, one guest can run BIG-IP Local Traffic Manager (LTM) only, while a second guest can run LTM and BIG-IP ASM.

Important: Once you provision the vCMP feature, you cannot provision any BIG-IP modules, such as BIG-IP LTM, on the vCMP host. Moreover, if any BIG-IP modules are already provisioned on the system before you provision the vCMP feature, those modules are de-provisioned when you provision the vCMP feature. This, in turn, interrupts any application traffic currently being processed.
Note: The reserved disk space protects against any possible resizing of the file system.