http://www.renevester.com/2009/06/the-essentials-of-virtualization-part-1-the-players/ Server based computing and virtualization made available with enthusiasm. Tue, 02 Nov 2010 17:44:30 +0000 hourly 1 http://wordpress.org/?v=3.2.1 http://www.renevester.com/2009/06/the-essentials-of-virtualization-part-1-the-players/comment-page-1/#comment-104 Christian Eilskov Fri, 26 Jun 2009 04:54:55 +0000 http://www.renevester.com/2009/06/the-essentials-of-virtualization-part-1-the-players/#comment-104 Hi Rene, Thanks for a great post. I just need to correct you a little with the statement around XenServer running on a well trimmed Linux. Actually XenServer is running on top of a 64 bit hypervisor layer and not in top of a Linux. The Control VM/Domain is based on Linux, and the Control domain and all the VM’s are running on top of the hypervisor layer. This gives the Linux VM’s great performance when using paravirtualized drivers, letting them access the hardware in a secure, fast direct way. When hosting MS VM’s the story differ a bit, we then depend on virtualization technique build by the CPU vendors. With the new Xen kernel released with XenServer 5.5, we put more of the hypervisor work like handling Shadow Pageing into the CPU, so we will an increase in the performance there too. Regarding the features in the XenServer Free, we have Unlimited VMs, unlimited memory, unlimited CPUs, XenMotion live migration, Multi-server management, and Workloadbalanceing. Hi Rene,
Thanks for a great post.
I just need to correct you a little with the statement around XenServer running on a well trimmed Linux.
Actually XenServer is running on top of a 64 bit hypervisor layer and not in top of a Linux. The Control VM/Domain is based on Linux, and the Control domain and all the VM’s are running on top of the hypervisor layer. This gives the Linux VM’s great performance when using paravirtualized drivers, letting them access the hardware in a secure, fast direct way. When hosting MS VM’s the story differ a bit, we then depend on virtualization technique build by the CPU vendors. With the new Xen kernel released with XenServer 5.5, we put more of the hypervisor work like handling Shadow Pageing into the CPU, so we will an increase in the performance there too.
Regarding the features in the XenServer Free, we have Unlimited VMs, unlimited memory, unlimited CPUs, XenMotion live migration, Multi-server management, and Workloadbalanceing.

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