单项选择题 A bank has requested proposals for a storage solution to upgrade their disaster recovery processes for their IBM System z， UNIX， and Microsoft Windows environment. The solution must simulate a multi-site environment and provide the customer the ability to evaluate Metro Mirror， Global Mirror， Global Mirror for z/OS， and FlashCopy. 120 TB physical capacity is required per site. Only Fibre Channel drives can be used.  Which solution best meets the specified requirements（）

单项选择题 A customer has an IBM System Storage DS8700 and wants to reach the highest possible throughput in the back-end for a storage-pool-striped volume out of an extent pool with 8 ranks.  Over how many device adapter pairs should a technical specialist spread the workload（）

单项选择题 A customer has requested an IBM System Storage DS8700 solution to meet the following requirements： - 20% yearly growth - 29，000 IOPS  - approximately 50/50 mix of read/write operations - small （4 KB） data transfers  The storage specialist has created a Disk Magic model in which each port is capable of approximately 2，900 to 3，100 IOPS.  What is the minimum number of ports that should be configured on the DS8700 to handle the projected workload for the first year（）