单项选择题
A. More disk should be added to the disk heartbeat network，allowing more paths for heartbeats.
B. An RS232 network is required to supply a more robust non-IP network when disk heartbeating is implemented.
C. The network tunable parameters should be changed to allow more missed heartbeats since the disks may be heavily used.
D. An error notification method is required to determine the action to take in response to a failure of the disk heartbeat.
单项选择题 A two-node cluster provides NFS exports to a variety of UNIX clients. During fallover testing，it is determined that some clients are unable to mount the exported filesystems after fallover，and before node reintegration. It is verified that the filesystems belong to a resource group and are correct in /usr/es/sbin/cluster/etc/exports. Which of the following may provide a possible solution to this problem？（）
单项选择题 A new administrator is performing fallover testing on a two-node cluster and is concerned that the cascading resource group belonging to Node ’A’ did not reintegrate properly after the cluster was restarted on Node ’A’. A stable cluster is reported by clstat，and clRGinfo reports the resource group online on Node ’B’. What type of configuration would cause this type of behavior？（）
单项选择题 Company.com with a newly installed cluster has been checking the logfiles to determine if the cluster has had any recent activity. The non-IP RS232 heartbeat connection seems to be having a difficulty. The serial network goes down，and then a couple of minutes later comes back up again. This pattern is repeated many times in the log. If this system was installed without regard to best practices， what is the most likely problem with the serial network？（）