VDC 2.0 Data Sheet: Vertical scaling of virtual machines

Introduction

Test results for vertical scaling

 

Introduction

Vertical scaling means changing the CPU and/or RAM capacity of one virtual machine, typically in response to the changing load requirements of running applications. This is in contrast to horizontal scaling which means adding (or removing) separate VMs to handle variable loads imposed by running applications (for example, where a group of webserver VMs share the load of running a website).

In VDC, all virtual machines can perform static vertical scaling: when a VM is in a Stopped state, its service offering (CPU and RAM) can be set to any configuration available (both larger and smaller), and the new configuration will be adopted when the VM is started.

Dynamic scaling of a VM is more complicated as it depends on the hypervisor, the operating system (and the particular version), and the operating system source template used to deploy the VM. In some cases, only one of CPU or RAM scaling may be available. Alternative names for dynamic scaling include 'hot add' of RAM and 'hot plug' of CPU.

In the current VDC, dynamic scaling can only be upwards. The new service offering for the VM must have: same CPU, more RAM; or more CPU, same RAM; or more CPU, more RAM.

The following table shows OS templates that have been tested for correct performance in dynamic scaling. However there are some specific limitations to be aware of:

  • There is a RAM limitation for Linux 64-bit machines: a running VM with initial RAM 512 MB or 1 GB can be scaled upwards only as far as 2 GB. To go further it is necessary to stop the VM and change the RAM to 4GB.

  • For VMs with more than 8 CPUs on the ESXi hypervisor, the VM may not be able to access in full the additional performance of an added unit of CPU, and memory performance can also be affected.

If you have particular requirements for dynamic scaling, please ask (via LiveChat) for advice.

Important

This information applies only to the Interoute Virtual Data Centre 2.0 service. Last updated: 07 November 2014

 

Test results for vertical scaling

Hypervisor OS Template name Static scaling (UP/DOWN) Dynamic scaling (UP) Dynamic scaling (DOWN) Notes
ESXi Windows 2008 R2 Windows Server 2008 R2 (64-bit) CPU and RAM CPU and RAM No ESX limitation on dynamic scaling down
ESXi Windows 2012 Windows 2012 CPU and RAM CPU and RAM No ESX limitation on dynamic scaling down
ESXi Windows 2012 R2 Windows 2012 R2 CPU and RAM CPU and RAM No ESX limitation on dynamic scaling down
ESXi Windows 2012 R2 (non-Internet activation) Windows 2012 R2 M CPU and RAM CPU and RAM No ESX limitation on dynamic scaling down
ESXi CentOS 6.5 IRT-CENTOS-6.5 (04/04/2014) CPU and RAM Not working No Scaling fails with this template
ESXi CentOS 6.4 Centos 6.4 (64-bit) [found in Community tab] CPU and RAM CPU and RAM No ESX limitation on dynamic scaling down
ESXi Debian 7.4 IRT-DEBIAN-7.4 (04/04/2014) CPU and RAM No No Not enabled for Interoute template**
ESXi Ubuntu 12.04 IRT-UBUNTU-12.04 (07/04/2014) CPU and RAM No No Not enabled for Interoute template**
ESXi Red Hat (RHEL) 6.5 IRT-REDHAT-6.5 (16/04/2014) CPU and RAM No No Not enabled for Interoute template**
ESXi pfSense 2.1.3 IRT-PFSENSE-2.1.3 CPU and RAM No No Not enabled for Interoute template**

** For Linux OS where dynamic scaling is not enabled, it is possible for the user to deploy from ISO image source to enable dynamic scaling.

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