Over the years there have been some controversy over this topic. Should Virtual Center (vCenter) be physical or virtual? There is the argument that it should be physical to ensure consistent management of the virtual environment. Of course there is also the fact that Virtual Center requires a good amount of resources to handle the logging and performance information.
I’m a big proponent for virtualizing Virtual Center. With the hardware available today there is no reason not to. Even in large environments that really tax the Virtual Center server you can just throw more resources at it.
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Categories: VMware Tags: Capacity, ESX, ESX 3.5, ESXi, Failover, HA, service console, vCenter, Virtual Center, virtualization, VMware
In the previous years Business Continuity and Disaster Recovery have been big buzz words. All companies small and large vowed to launch initiatives to implement either or both in their current IT strategies. My question is what happened? Why is it that I rarely see organizations that have implemented or even have a plan to implement Disaster Recovery?
Is it a lack of understanding? Is it that most companies believe it is to expensive or complicated to implement? Well it doesn’t have to be either. Most companies that are undergoing virtualization initiatives already have half if not more of what they need to implement Disaster Recovery. The simple fact is if you already have at least two data centers and are virtualizing you are a prime candidate. Here are some common question and my answers regarding this subject:
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To properly size a HA fail over cluster there are a few things that need to be determined. You need to know how many hosts are going to be in your cluster, how many hosts you want to be able to fail (N+?), and it helps to know resource utilization information about your vm’s to gauge fluctuation. Once we know this information we can use a simple formula to determine the maximum utilization for each host to maintain the appropriate DRS fail over level.
Here is an example:
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