单项选择题
A.it is cost efficient， as a single N series or DS8000 can have its controllers split between the primary and secondary site and use semi- synchronousmirroring while using asynchronous mirroring to a third site
B.the second site acts as a repeater station so that greater geographical distances can be achieved
C.ITprovides high availability together with disaster recovery by implementing Metro/Global Mirror across three geographically dispersed systems
D.it guarantees data protection by implementing two synchronous copies of the primary site data
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（）
单项选择题 WhatisakeydifferentiatorbetweenaDS8700andDS8800foracustomerlookingforahighcapacitysolutionatthelowestcost（）