Because of its new features and enhancements, many of your customers are likely anxious to start planning their vSphere 5 upgrade, and it’s important to know new caveats and issues before you let your customers dive right into it.
Solution providers can ensure a smooth transition to vSphere 5 by taking note of these important modifications and understanding what they mean to individual customer environments:
Perhaps the biggest vSphere 5 deviation from previous versions is that your customers will need to deal with the new licensing model.
VSphere 4 licensing was fairly straightforward: as licenses were bought per CPU socket and you could run unlimited virtual machines (VMs) on the host. That model is no more with vSphere 5, and while licenses are still sold per CPU socket, each license comes with a fixed amount of virtual RAM (vRAM) that can be assigned to VMs. Depending on the environment, this could cause a customer to spend thousands of dollars in additional licenses to be compliant with new vSphere 5 licensing. The new model favors scale-out architectures that hold a greater amount of hosts that have smaller resource amounts. This means less VMs running on each host, which results in less vRAM usage per host. When you try and scale up with hosts that have large amounts of RAM, the additional license costs to match the amount of that RAM in a host can get very costly.
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