单项选择题 An international company has a heterogeneous IBM storage environment with two IBM DS8700 systems in a Metro Mirror relationship. They also have a virtualized environment with two SVC clusters in a Global Mirror relationship. The storage administrator complains about the monitoring of copy services.  Which solution should the IBM storage specialist propose for this pain point（）

单项选择题 Two DS8700 systems have been proposed for a disk-to-disk BC solution. Each system has 200 TB installed， with a data change rate of 18% per day. Two 2 Gbps CWDM links are in place between the remote data centers with an average utilization rate of 55%. The proposed solution   includes additional CWDM ports.  Which of the following should justify the additional CWDM ports（）

单项选择题 WhichofthefollowingstatementsaboutDS8000harddrivetechnologyiscorrect（）