Increased VM density isn’t necessarily a bad thing. It can help reduce OS licensing costs, network connections and the size of a data center’s footprint. The key to controlling VM density is to evaluate its functionality in the event of a failure. VMware offers high availability (HA), predictive HA and fault tolerance to help recover from system failures.
These technologies help prevent workloads from going offline and reduce the need to quickly restart them after a host failure. These features also work with small and large hosts, but their effectiveness can vary depending on the size of the VMware hosts and VM density. Host size is often based on CPU or memory load. CPU is usually the top consideration because memory is easier to adjust than CPU cores. Depending on your math, you might want to allocate two to four vCPUs per core.
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