2005年2月,某轮船上发生原因不明肺炎的暴发流行。出港时船上共有350名乘客,2月份第一周(1~7日)中,船上有30人发生肺炎,其中一半很快死亡。接下来的一周内又有20人发病,但没有死亡病例,假设该病病程约为1个月。2月7日该不明原因肺炎的患病率是()。
A. 0.045
B. 0.075
C. 0.143
D. 资料不全,无法计算
E. 以上答案均不正确
A customer is using Metro Mirror to mirror the company inventory database from an IBM System Storage DS8700 at their headquarters to a DS8300 at a remote site. Due to bandwidth concerns they are planning to change the mirroring mode to Global Mirroring. They have asked for assistance. What must be done to help the customer make the change?()
A. reboot the secondary system
B. rezone the Storage Area Network switches
C. break and re-establish the mirror relationship
D. increase the buffer credits in the HBAs to reflect the new mirror relationshi