单选题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 (esp
题目
单选题
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()
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