What features or capabilities are Red Hat Enterprise Virtualization missing compared to vSphere and Hyper-V?
A lot has happened in the virtualization vendor landscape lately. Red Hat recently released Red Hat Enterprise Virtualization 3.1, and Microsoft released Hyper-V 2012, which are both important steps forward. Both companies have added important features, closing the gap with market leader VMware. Given these improvements, I would say that RHEV features compare well to the other major hypervisors on the market today.
At this point, I don't think any of the top three hypervisors -- VMware vSphere, Microsoft Hyper-V and RHEV -- have any serious omissions. All provide basic functionality that any virtualization infrastructure should offer. RHEV features many of the same high-end capabilities organizations are looking for. All three, for example, now offer some form of live migration of VMs. Many of the differences among the three vendors lie mainly in scalability details -- the max virtual CPUs per virtual machine, for example. Some important differences do still exist though. These differences are mainly in the field of integration with other products. VMware vSphere integrates very well with VMware cloud solutions, and Microsoft Hyper-V integrates well with Microsoft management solutions. You can see that all the products are focusing on their own unique characteristics, which makes them stand out from the competition. Then of course, there's the difference in pricing.
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