- Activate a Free XenServer Product
- Managing Licenses
XenServer Advanced, Enterprise and Platinum Editions share the same licensing model as other Citrix products, and each host server requires a license to be installed on to a separate Citrix Licensing Server. For details of how to install and run Citrix Licensing, look at the Citrix online documentation on the Citrix eDocs website.
You can manage your XenServer Advanced, Enterprise and Platinum Editions licenses from XenCenter using License Manager: on the Tools menu, click License Manager. Via the License Manager, you can:
Each host server in a XenServer resource pool must be individually licensed. For example, if you are supporting four XenServer hosts in a resource pool, you must assign a license to each of the four hosts. While it is possible to mix different editions of XenServer hosts in the same pool, it is important to note that the host with the lowest license determines the features available to all members in the pool. For example, a pool with a mixture of Advanced and Platinum Edition hosts only has the Advanced features enabled. Therefore, if you change a host to use a lower level of license, you can effectively disable features in the pool.
XenCenter contacts the specified Citrix V6 license server and requests a license for the specified server(s). If successful, a license is checked out and the information shown in the XenCenter License Manager will be updated. If the license server cannot be contacted, then the server lapses into a 30-day licensing grace period.
Citrix V6 licensing has built-in timeout technology. If a XenServer host cannot contact the license server, for example, due to problems with the license server hardware or software or network failures, there is a 30 day grace period that allows XenServer hosts to continue operations as if they were still in communication with the license server. After a startup license is checked out by a XenServer host, the XenServer and the license server exchange "heartbeat" messages every five minutes to indicate to each other that they are still up and running. If XenServer and the license server fail to send or receive heartbeats, XenServer lapses into the licensing grace period and licenses itself through cached information. The grace period is 30 days and when the grace period runs out, XenServer stops accepting connections. After communication is re-established between XenServer and the license server, the grace period is reset. The grace period takes place only if the XenServer has successfully communicated with the license server at least once.