During the pre-installation planning of a customer’s recently purchased IBM System Storage DS8700 the port configuration， cabling， and disk layout were discussed. 
What other topic should be discussed in this solution review（）

A customer has installed an IBM System Storage DS8700 with 20 TB of storage， two-way processor version， 32 GB cache， and 16 Fibre Channel ports. The customer is beginning to experience throughput performance issues. 
To address this performance consideration with minimal cost to the customer， which of the following should be the FIRST step to resolve the problem（）