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The biggest performance barrier in any virtualized environment is resource contention. Today's hyper-converged infrastructures are preconfigured for optimal performance, so most of the performance tuning has been done before a customer even purchases a system. However, there are three steps a data storage administrator can take to ensure their hyper-converged infrastructure performs to the best of its ability.
Avoid overloading resources
There is a trade-off between virtual machine density and VM performance. As virtual machine density increases, performance tends to decrease because more VMs are competing for hardware resources. Placing an excessive number of high-demand VMs on a single virtualization host or storage device can have a similar effect. Administrators should use performance monitoring to ensure VMs do not encounter resource contention issues that overtax the physical hardware.
Take advantage of storage quality of service
Storage QoS technology can be used to reserve storage bandwidth or prevent excessive storage bandwidth consumption on a per-VM basis.
Storage QoS options vary from one vendor to the next, and third-party offerings also exist. In many cases, a storage administrator can use performance monitoring to determine the minimum number of storage IOPS a VM needs to perform at an acceptable level. Storage QoS can then be used to reserve those IOPS for the VM to avoid resource contention. Similarly, an administrator may use storage QoS to cap storage bandwidth usage for high-demand VMs so they don't consume an excessive amount of IOPS, thereby depleting hardware of the ability to give other virtual machines the IOPS they need.
Use an efficient configuration within each guest operating system
You should disable any system service that consumes resources without providing a significant benefit and return. For example, some administrators like to disable the Windows Indexing service in an effort to decrease resource contention and over-consumption for VMs.
How hyper-converged infrastructures utilize resources
Hypervisors and resource contention: Balancing virtual and physical resources
VDI takes on resource contention, latency with hyper-convergence
Advantages of hyper-converged platform technology for enterprises