单项选择题 Due to recent changes in infrastructure， a four-node cluster has been split into two locations， but  is still listed as a single site in HACMP. The location split has proceeded smoothly， the only exception being the serial heartbeats. There are constant errors causing the serial network to go up and down.  What is the best solution to resolve this issue？（）

单项选择题 Company.com has decided to implement virtual hosts in their web server. The current estimate is to create six virtual hosts with unique URL’s and IP addresses. The solution is going to use the IP aliasing faction in HACMP.  How many resource groups are required to support this configuration？（）

单项选择题 Company.com has a resource group that contains a database that is accessed by a web client  based on another system. The communication to the database is TCP/IP. Occasionally after a failure， the end users get unusual error messages that indicate the database server is not available. It has been determined that the web server is trying to access the database server’s information before it has completed file system recovery after a failure.  How can HACMP affect this problem？（）