A customer has multiple applications on multiple open platforms in their current environment based on IBM System Storage DS8100. They plan to set up a business continuity solution that meets the objective of zero or little data loss for their business critical data. The customer has indicated that cost is a factor. 
What should the storage specialist recommend（）

Tiered disk systems （DS8700 and DS5020）， tape backup and Cisco director（s） utilizing VSANs have been proposed as a solution. The storage specialist is asked to explain the technical
advantage of using Cisco directors and VSANs. 
Which of the following is the key point to stress to the customer（）