单项选择题 A global customer’s IT strategy is based upon two DS8000 systems and an N series gateway. They want to protect their  business by implementing a disaster recovery solution. The storage specialist has recommended cascaded mirroring.  Which of the following is the business benefit of cascaded replication（）

单项选择题 A company has a 30 TB multi-vendor storage environment attached to System i and open systems. They are concerned about the time and effort caused by frequent migrations to new storage hardware for open systems data. In addition to consolidating their storage to a single platform， they would like to take advantage of advanced features such as Easy Tier and implement a three-site business continuity strategy.  Which product provides the best long-term solution for this company（）

单项选择题 A customer wants to purchase an IBM System Storage DS8700 to support a high-performance database environment.  Which technical solution gives the customer the best relationship between I/O performance at the machine’s backend vs. capacity installed in the machine（）