Storage performance problems can be caused by different factors. In most cases, problems exist at the storage level, for example, overloaded storage and slow storage. We will list the main causes of these two problems. The main cause of overloaded storage is that the vSphere administer doesn't know what the IOPs requirement of an application that is being run in a virtual machine is, if some application performs sequential I/O and another application performs random I/O. The application vendor or end user needs to give this information to the vSphere administrator or storage administrator. As best practice, don't mix these two different types of I/O in the same RAID group, because it will cause some performance degradation. In other situations, entry-level storage is the most common cause of performance problems in a vSphere environment. It can provide limited disk IOPs, high latency of disk can cause performance problems. You can monitor...