单项选择题
A.it provides synchronous mirroring on both sides
B.it can be implemented withoutFlashCopy volumes at the target site
C.with Global Mirror， the Metro Mirror functions can be used over continental distances
D.it has almost no impact on application performance because of its extremely short andadjustable coordination time
单项选择题 A current IBM System Storage DS8000 open systems customer needs a temporary copy of data that will be needed for only 12 hours. Which DS8000 function best satisfies this requirement（）
单项选择题 A customer requires an infrastructure to support disaster recovery of critical applications between two remote data centers. One data center is in Tokyo and one is in Beijing. The customer’s Recovery Point Objective （RPO） requires a six-hour window for a bandwidth of 100 MB/s and a new storage system for a total of 4 TB of data. They estimate 100 MB of new data produced hourly. What data synchronization method would be recommended to meet the requirements（）
单项选择题 A customer has no available floor space for expansion and room for only one disk enclosure pair in their DS8700. Four disk enclosure pairs are required to meet the current I/O needs of a data warehousing application. They are only utilizing 10% of their total capacity. Another application workload needs to be added to the system but requires two disk enclosure pairs. The customer is considering SSD and Easy Tier. Which of the following is the primary function of Easy Tier（）