Storage arrays put an organization's data behind controllers built for the job: SAN and NAS arrays that serve block and file storage to virtualization clusters and applications, expansion shelves that grow existing arrays, and the entry arrays that give a small site proper shared storage instead of disks scattered through servers. Shared storage is what makes server failover, snapshots, and central data protection possible.
An array is sized, not picked: capacity is the visible number, but performance - drive mix, controller class, and network connectivity - is what the workloads will actually feel. Match the array's protocols to the environment it joins, plan expansion shelf compatibility from day one, and treat support coverage as part of the product, because storage is the layer an organization cannot improvise around. Standardizing one array family keeps operations learnable. COLAMCO quotes storage arrays, expansion, and support against the workloads they will carry for business, government, and education datacenters.