A new fail-safe mode allows Cross-Server Private Networks, ACLs, quality of service (QoS), RSPAN and NetFlow settings to continue to be applied to a running VM in the event of vSwitch Controller failure.Ī memory-over-commit feature is available, and is called Dynamic Memory Control (DMC), which is a "ballooning" operation, and is only available in the XenServer Advanced or higher editions. The improvements in virtual networking are in distributed virtual switching. Version 6 has improved guest OS support, including Ubuntu 10.04 (32/64-bit) updated support for Debian Squeeze 6.0 (64-bit), Oracle Enterprise Linux 6.0 (32/64-bit) and SLES 10 SP4 (32/64-bit) and experimental VM templates for CentOS 6.0 (32/64-bit), Ubuntu 10.10 (32/64-bit) and Solaris 10. There is a maximum of 16 nodes per cluster, and up to 800 VMs and dynamic memory allocation amongst VMs is supported. A physical GPU can also be assigned to a VM, so the guest can leverage GPU instructions, which is very useful for delivering 3D graphical applications via virtual desktops. On the other hand, VM RAM is a little better than Hyper-V, but still lagging VMware at 128GB for Windows. Host specifications are quite similar to Hyper-V - the limits guide notes that up to 130 logical CPUs are supported on a host machine, but this is dependent on the physical CPU type and 1TB of RAM. Creating, backing up and copying VMs is a doddle, as is adding other host servers to the cluster and generating performance statistics. To its credit, XenCenter is remarkably easy to use, and has a very clean interface we consider it to be more user friendly than either Hyper-V or VMware. The same CD is also used to load the XenCenter management console on a Windows-based PC. It's the easiest and most painless of the three hypervisors to install.
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