多项选择题 Several reports are logged stating that an application server is performing slowly. During the investigation， the administrator notices that the hard drives on the server appear to have a high level ofactivity.  Which items should the administrator monitor using performance monitoring tools？ （）

单项选择题 Anadministratorneedstomaintain1TBofstorageformissioncriticalapplicationdata.Faulttoleranceandperformancearethemostimportantconsiderations.Costisnotafactoratall.WhichofthefollowingRAIDconfigurationswouldbetheBESTchoicetomeetthecriteriaforthe storagearray？（）

单项选择题 Which of the following factors is the MOST likely cause of a power supply fan failure?（）