A mirrored root disk needs to be replaced. Which of the following commands will clear the boot record on the failing disk？（）

单项选择题Asystemadministratorhasdeterminedarootmirroreddisk，hdisk1，needstobereplaced.Therootvolumehasbeenunmirrored.Whatisthenextsteptoremovethediskdrive？（）

A.cfgmgr
B.rmdev -d hdisk1 -l
C.reducevg rootvg hdisk1
D.have the IBM CE replace the disk

单项选择题Followingasystemboot，thedisplayindicatesthatpreviouslydetectedhardwareismissing.Whatcommandshouldbeusedtoidentifythemissinghardware？（）

A.diag
B.lscfg
C.cfgmgr
D.lsattr

单项选择题Asystem’sbackupsarefailing.Errorloganalysisindicatesthatthereiseitherahardwareormediaproblem.Whichcommandisusedtodetermineifthereisahardwareproblemwiththetapedrive？（）

A.diag
B.lscfg
C.lsdev
D.cfgmgr

单项选择题Asystemadministratorwouldliketoverifytheuserdefinitionsinthe etc passwdfile.Whichofthefollowingcommandswillaccomplishthis？（）

A.usrck
B.sysck
C.lssec
D.lsuser

单项选择题Asystemadministratorhasbeenaskedtolockaspecificloginaccount.Whichofthefollowingcommandsisusedtoaccomplishthis？（）

A.pwdck
B.usrck
C.chuser
D.rmuser