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February 2012, Vol. 37

Prevent server over-consolidation with optimal VM resource allocation

Although there is no denying the benefits of server virtualization, it’s possible for this technology to become too much of a good thing. IT managers have learned that the best way to make the most out of their server hardware budget is to seek the highest possible density -- packing virtual machines on each physical server. The problem is that this principle is often taken to the extreme, leading to over-consolidation that can actually threaten server performance and stability. Looking for server over-consolidation So how can you tell if your virtual machines have been over-consolidated? One way to find out is through the use of performance monitoring. Microsoft provides a number of metrics that Windows Server administrators can use to determine whether or not servers have been allocated sufficient resources. For example, Windows administrators might look at the Memory/Available Bytes counter to ensure that the server is not running short on memory. Although the Performance Monitor does not exist in Linux, there are plenty of ...

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