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What not to do when you’re consolidating: Five common VM mistakes
This article is part of the Virtual Data Center issue of February 2012, Vol. 37
To get good virtual machine (VM) consolidation ratios, avoid these common mistakes and apply a little common sense to VM specification and placement. 1. Creating contention To achieve high consolidation ratios, you’ll want to avoid contention. That can happen when you have more than one VM on the same host, network or storage unit, leading to the possibility they could compete for resources. Focus on the “four core” resources— CPU, memory, disk and network—and make sure that you don’t gather intensive VMs on the same resource. Separate network- and disk-intensive VMs on different networks or spindles to massively increase scalability, while at the same time reducing the chance of performance problems later. 2. Overtaxing the scheduler Placing two CPU-intensive VMs on the same physical host will not only tax the CPUs unnecessarily, but also cause the hypervisor’s “scheduler” to work harder. The scheduler decides where the VM’s vCPU executes, and the more vCPUs you allocate to the VM, the harder the scheduler must work to ...
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Features in this issue
Get better consolidation ratios by avoiding these typical problems.
Finding the best virtual server consolidation ratio is difficult, and larger, virtualization-friendly servers do not necessarily ease the process.
The push for high utilization can cause serious VM performance issues, but proper VM resource allocation can prevent server over-consolidation in virtual data centers.
Columns in this issue
There’s no one-size-fits-all when it comes to data center servers and technology.