单项选择题 A new Disaster Recovery site has been established using Metro Mirror to hold synchronous data at both sites. After the Metro Mirror is started， one of the most important applications， a DB2 database， slows down. An analysis shows that the I/O rate （especially write I/Os） is less than 40% compared to the former rates.  What is the best explanation for this behavior（）

单项选择题 An IBM Business Partner sells an IBM System Storage DS8700 to a customer.  Who is responsible for the installation and set up of the storage server（）

单项选择题 A customer’s SAN environment has undergone significant growth over the past two years. They have also suffered a high turnover rate with administrative personnel. The customer has asked a storage specialist for help in documenting and understanding their changing SAN environment. The ability to make configuration changes to devices would be a plus.  Which tool should the storage specialist suggest（）