单项选择题 A customer with a small IT budget has one data center. Their main application is a database running on an IBM System Storage DS8000. The database has a data change rate of 50% per day. Once a week， they must do a point-in-time backup from the database to tape. The time it takes to run the backup now exceeds the backup window allowed. The customer requests a proposal to reduce database downtime caused by running backups， with nearly no impact to production volumes.    In addition to the tape backup， which DS8000 feature should a technical specialist propose（）

单项选择题 A customer wants to directly attach five servers to an IBM System Storage DS8100. They do not intend to use any SAN switches and would like the servers to have a redundant connection to the IBM DS8100. What is the minimum number of DS8000 host adapter cards that the customer will require（）

单项选择题 A customer has an IBM System Storage DS8100 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（）