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單項(xiàng)選擇題

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（）

A.the bandwidth of the PPRC connection between the two sites is too small
B.the DS8000 SFI at the remote site was shipped with slower disks
C.I/O rates vary， depending on the distance between the two sites and the rates cannot be changed easily， due to latency
D.the DB2 database does not work with Metro Mirror without an additional license

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