The Open Telekom Cloud is switching all the flavors of its Elastic Cloud Server offering to the Kernel-based Virtual Machine (KVM) hypervisor. Telekom is replacing the flavors, which are currently still operated on the basis of the Xen hypervisor, with new KVM flavors that are at least equivalent.
"Overall KVM offers more functionality and stability in cloud operation. Most applications gain noticeably in performance with KVM," says Andreas Falkner, Vice President Open Telekom Cloud. "Overall, KVM better meets the demands of cloud operations. In addition, we are now standardizing our cloud offering, which ensures end-to-end compatibility and reduced complexity for companies.“
Support from Telekom experts in switching from Xen to KVM
KVM has become the de facto standard within the user community. The clear majority uses KVM, many have already switched on their own from Xen to KVM. For companies that continue to use Xen-based flavors on the Open Telekom Cloud, Telekom experts offer support for the switchover. "Switching from Xen to KVM within the Open Telekom Cloud is uncomplicated in most cases. Companies have to shut down corresponding systems and restart them on the new flavor," says Clemens Hardewig, Vice President Open Telekom Cloud Delivery.
Telekom has produced a Migration Guide that explains exactly how this works in detail; both for systems running Linux and for Windows-based machines. It also shows which KVM flavors will replace the Xen flavors, what possible problems there might be with drivers and device names, and how users can keep IP addresses and volumes unchanged if necessary, despite changing flavors.
Users have three months to switch from Xen-based to KVM-based flavors. After that the Xen flavors will be switched off for good. The transition period begins on June 30, 2019. The deadline for the switch is therefore September 30, 2019. In order to avoid failures, all users of flavors with Xen hypervisors must have switched to a KVM equivalent by September 30, 2019 at the latest. If companies have any questions, they can contact Telekom experts at any time on 0800 33 04477 if calling from Germany or 00800 44 556600 for those calling from other countries.
Xen flavor for SAP systems, large memory and GPU flavors excluded from changeover for now
In order to enable customers to continue to provide SAP services, the certified SAP flavors based on the SUSE Linux Enterprise Server are initially excluded from the changeover and are therefore still available in the shop for the time being. The supply of the flavors will end in the second quarter of 2022, so Reserved models with a term of 36 months will still be available until the second quarter of 2019. Reduced runtimes and Elastic models will be available until the end of the remaining term.
Interested users can find an overview of certified SAP flavors on the Elastic Cloud Server detail page.
At the same time, Deutsche Telekom is seeking the certification of KVM flavors for SAP. The company expects the first certified flavors to be available in the second quarter of 2019. Deutsche Telekom will announce the availability as soon as this happens.
In addition, the large memory flavor and all GPU flavors are also excluded from the conversion to KVM for the time being. The relevant users will be informed separately when Telekom converts these flavors from Xen to KVM.
An overview of the most important questions about the Xen-KVM migration on the Open Telekom Cloud (FAQ)
Do companies that currently rely on the Open Telekom Cloud’s Xen-based flavors need to switch over?
Yes, Telekom will replace all Xen-based flavors with KVM flavors. The certified SAP flavors based on the SUSE Linux Enterprise Server, the large memory flavor and all GPU flavors are excluded from this for the time being.
When will Xen-based flavors be switched off in the Open Telekom Cloud?
First, the rollout of new Xen machines will be discontinued. These will then no longer be offered in the shop. However, the existing flavor’s Start, Stop, Backup and Restore functions will remain available until they are completely switched off. The transition period is three months and starts on June 30, 2019. The latest date for the switch is September 30, 2019.
What are the disadvantages of the changeover for companies?
The only disadvantage is the process of changing the affected flavors itself, which is unfortunately necessary.
What do companies that use Xen-based flavors in the Open Telekom Cloud need to know?
Users have to switch to a KVM-based flavor within the three-month transition period. Otherwise systems with the Xen flavor will be switched off. Before this happens, the Open Telekom Cloud team will inform the users of the flavors concerned several times by e-mail.
How can companies switch from Xen-based flavors to KVM-based flavors?
That depends on the way companies use Xen-based flavors within the Open Telekom Cloud. There are detailed instructions in the KVM Migration Guide, both for systems running Linux and for Windows-based machines. Telekom also offers telephone support at: 0800 33 04477 for callers based in Germany or 00800 44 556600 for those calling from other countries.
What happens with the Reserved Upfront packages?
Existing Reserved Upfront packages for certain Xen flavors will continue to run. However, if you want to switch to KVM earlier, you can migrate the packages one to one.
Are dedicated host flavors affected?
Yes, dedicated hosts are also be part of the migration.
Which exact flavors in the Open Telekom Cloud are affected?
|DeH general||DeH s2-medium|
|DeH h1||DeH c3|
|Xen Flavor||KVM Equivalent|
At a glance: the benefits of Open Telekom Cloud
- Security: The data are hosted in highly secure Telekom computing centres in Germany.
- Scalability: Computing power and memory can be ordered and set up online and adapted flexibly at any time.
- Pricing models: We offer you flexible and fixed contractual periods as well as a combination of both models.
- No vendor lock-in: Open Telekom Cloud is based on OpenStack, a freely available open-source standard. You can change the provider at any time.
- Individual configuration: CPU, RAM, storage, network – you can put a package together for yourself that matches your requirements to the optimum degree.
- IaaS for all: Open Telekom Cloud is extremely flexible and therefore suitable for companies of every size.