单项选择题 A customer is currently using EMC disk. They are having an issue with the time it takes to complete a backup. What IBM tool can be used to show how much improvement can occur in the time it takes to backup the disk?（）

单项选择题 The IBM XIV Storage System supports all of the following fiber channel speeds EXCEPT:（）.

单项选择题 Which IBM storage product is offering Easy Tier technology?（）