Explanation Before adding new capacity to a Dell PowerStore 1000T model array, it is important to consider the NVRAM requirements. The customer should use the Dell Storage Array (DSA) ordering system to determine if more NVRAM is supported for their specific PowerStore model. This will ensure that the array has enough NVRAM to support the additional capacity, and to avoid potential performance issues. It's also important to note that the Dell PowerStore 1000T supports up to 4 NVRAM modules, not only two, and adding an expansion shelf does not necessarily mean that more NVRAM is needed, it depends on the specific requirements of the workloads and the amount of capacity added. The Dell PowerStore Manager UI can also be used to determine if more NVRAM is needed, it will provide information about the NVRAM usage, and allow to monitor the performance of the system and identify any potential bottlenecks.