Virt. Win Server benchmarks - VMWARE vs KVM vs XEN - where are they?
I'm currently researching my options for virtualising a number of Windows and *nix servers, but more Windows than nix. The problem is that all the benchmarks I've found so far that compare any of the different hypervisors have only benchmarked open source apps like Apache, dovecot and Postgres etc. running under Linux guests when what I need to discover now is how a vitualised Server 2008 guest (64-bit) runs AD, Exchange, SQL server, IIS, Sharepoint, SMB under the main competing virtualisation technologies compared to bare metal. I'd expect such a benchmark, if it exists, would utilise the PV/ virtio or whatever drivers each virtualisation solution provides for Windows Server so as to give the optimum results but other than that the test guests should be identical of course.
As it stands it looks like KVM has a slight performance edge over both Xen and VMware and ovirt seems to be the management console of choice for KVM but Xen and VMware are generally regarded as safer bets dur to their relative maturity. Hyper-V seems to be the also-ran only for the most devout MS shops.
Also, if there is anyone reading this who is familiar with both KVM and VMWare - are there any features that VMW has that KVM/ovirt doesn't that would make you consider shelling out all the extra cash required to go the VMWare route over the free and allegedly better performing KVM? Yes, I know about ESX but KVM and XEN seem to do a lot more for zilch quid.