单项选择题 A System p administrator needs to replace a failed internal disk in a mirrored rootvg.  Which of thefollowing is one of the steps that would need to be followed（）

单项选择题 An administrator needs to add the /usr/vac/bin directory to their PATH environment variable for the current session.  Which of the following will accomplish this task（）

单项选择题 An administrator attempts to add a new 100GB logical volume to the datavg volume group， which resides on hdisk1.  How can the administrator easily determine if there is enough space in datavg to create the logical volume（）