单项选择题
Which of the following commands can be used to determine if a disk drive is causing a bottleneck?（）
A. vmstat B. fileplace C. iostat D. lvmstat
单项选择题 Whatistheproperwaytostartasystemdumponthedefaultprimarydumpdevice?（）
单项选择题 WhichfileisNOTcontrolledbythealogcommand?（）
单项选择题 Apatchhasbeenappliedtotheoperatingsystem.Afterrebooting,thesystemishung.Whichofthefollowingcommandsshouldhavebeenperformedtopreventthesystemfromhanging?（）
