by Katherine
5. October 2009 14:41
Do you have computer-related questions that you cannot get answered?
If so, you have come to the right blog!
Send your questions to me at khobt@bncsystems.com with the subject line "Expert Q & A" and I will post your question and answer in a future blog. It can be anything from computer networking to server support to desktop setup to software-specific questions!
Please do not post as a reply to this blog - emailed questions will get a response.
by
8. October 2008 12:10
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by
15. July 2008 10:07
This weekend an instructor came in to talk to us about Windows 2008, and one of the topics covered was the Microsoft virtualization platform “Hyper-V”. The presenter offered the opinion that hyper-v is significantly cheaper than Vmware (e.g. $28) and offers the same functionality. On the surface this rings true, but I dug into this a bit deeper and have found that the reality is slightly more complicated. Comparing hyper-v to Vmware products is really trying to compare apples and oranges. A simple example of this would be the feature called “memory over commitment”. All Vmware solutions (including the free Vmware Server) allow for allocating more memory to virtual machines than is physically installed on the host and uses a variety of memory reclamation techniques (not just paging) to balance the requests for memory that the guests (virtual machines) make. This is not true with hyper-v – you are only allowed to allocate as much RAM as a host has. This means two things: 1) Vmware allows for a greater density of guests to be deployed per host, and 2) in instances where you have more than one Vmware virtual host and one has gone down you can start more VM’s in a degraded state to keep things running until you can correct the issue. These two things are not true for hyper-v – it refuses to allow you to start up more VM’s if the memory limits have been reached, even if the guests may not always use all the RAM allocated. At the end of the day this means that you need to spend more money on hardware with hyper-v to achieve the same results you would get with Vmware technologies. You might say “most SMB only have four or so servers, so you don’t need the overkill Vmware provides at the premium cost.” I agree, but only as far as the ESX line of software goes. Vmware also has a free version called Vmware server that provides excellent features for...well...free. I have personally deployed Vmware server v1.0x in production environments where we were getting a minimum of 8 guests per host on dual core dual cpu Dell hosts with 8gb of RAM. In some cases we were able to get 15 or more guests per host for things like file-n-print servers and domain controllers. Again your mileage may vary depending on the requirements of the guests, but the take away I want to highlight is that Vmware Server can do everything that hyper-v can at no cost and provides some advanced technologies that hyper-v has yet to implement. XEN is another alternative that is worth mentioning. You can use the free open source XEN and roll your own, or buy into the Citrix offering if you desire an easy deployment. Either way the XEN product is more comparable to ESX than it is to hyper-v with features such as live migration. The main issues I have found with XEN is it’s poor support for guest OS’s other than Linux or Windows, but for the SMB market this is not really much of a problem. The bottom line for me is that hyper-v is a v1.0 product whose feature set is very slim compared to other offerings in the same space. I look forward to seeing what Microsoft will do with this product, but the jury is still out. A colleague recently commented that “Microsoft can throw lot’s of engineers and money at hyper-v, so it will be feature rich and crush Vmware shortly.” and I agree that it could be done...but after a careful review of their recent attempts at revamping Terminal Services I have to say that it’s not necessarily the case that they will. My $.02 – I would love to hear what you guys think! Thanks!
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