单项选择题 While performing a site survey to document the existing environment before implementing a new HACMP cluster， it was discovered that a port filtering firewall was being used to protect the production system. The plan is to continue using the firewall and add a second firewall to avoid a single point of failure. Each node in the two-node cluster will have all of its network adapters connected to the firewalls， and all connections to the nodes will pass through these firewalls.  What must be considered about HACMP in a firewall environment？（）

单项选择题 An HACMP cluster has three nodes of unequal size. The largest node is Node ’A’. The primary application on Node ’A’ has two components. One component is memory intensive， the other is IO intensive. Nodes ’B’ and ’C’ are running web servers and databases that access information produced by applications on Node ’A’. The customer requires the most performance from the primary application and wants all nodes available for fallover processing.  Which of the following is the best solution for meeting the customer requirements？（）

单项选择题 Company.com wishes to use HACMP on two IBM eServer pSeries servers. During the planning  session， it was decided to use the native serial ports s1 or s2 for a non-IP heartbeat network.  What should be done to ensure the serial network will function with HACMP heartbeats？（）