单项选择题
A.Backup， unmount， remove， recreate and restore the filesystem.
B.Boot from mksysb tape and select Shrink filesystems on restore.
C.Unmount， run defragfs /usr and the reducefs -size XXX /usr commands.
D.Update /etc/filesystems with the desired size for /usr and reboot the system.
单项选择题 Asystemadministratorhasdeterminedthatthe/developmentfilesystemneedstobechangedfromJFStoJFS2totakeadvantageofthenewcapabilitesavailableinJFS2.Whatisthemethodtoconvertthe/developmentfilesystemfromtypeJFStoJFS2？（）
单项选择题 Whichcommandswilllistallthelogicalvolumesandthefilesystemdistributionacrossaspecificphysicalvolumeofthefollowing？（）
单项选择题 Asystemadministratorhasaserverexperiencingperformanceproblemswithlogicalvolumeswithinaparticularvolumegroup.WhichcommandcanreportI/Ostatisticsforlogicalpartitionswitheachlogicalvolumewithinthevolumegroup？（）