单项选择题

AnadministratorisorderinganewPower550.Theywillmirrorrootvgandareconcernedaboutsinglepointsoffailure.Whichofthefollowingfeaturesshouldbeordered（）

A.DualI/Oplanar，dualdiskdrives，dualSCSIadapters
B.Dualdiskdriveenclosures，dualdiskdrives，extramediabay
C.Dualdiskdriveenclosures，dualdiskdrivesanddualSCSIadapters
D.DualI/Oplanar，extramediabay，dualdiskdrives

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单项选择题

A1500pageprintjobwassenttothe"pel"queue.Thejobwasrunningforseveralminutesbeforeitwasdeterminedthatthejobwasnotneeded.Whichofthefollowingoptionswilldeletethejob（）IpstatQueueDevStatusJobFilesUserPP%HksCpRnkpdpelRUNNING201STDIN.27648root75010100011
A.kill201
B.cancel201
C.disablepel
D.Ip-d/var/spool/lpd/STDIN.27648

A.Thejobwasrunningforseveralminutesbeforeitwasdeterminedthatthejobwasnotneeded.Whichofthefollowingoptionswilldeletethejob（）IpstatQueueDevStatusJobFilesUserPP%HksCpRnkpdpelRUNNING201STDIN.27648root75010100011
A.kill201
B.cancel201
C.disablepel
D.Ip-d/var/spool/lpd/STDIN.27648

单项选择题

Thenicevalueis60inthepslisting.Whichcommandisusedtochangethistoavalueof20？（）

A.renice-n-20{PID}
B.renice-n20{PID}
C.renice-n-40{PID}
D.renice-n40{PID}