In AIX Version 5.3， a system administrator wants to cre……

单项选择题An administrator is ordering a new Power 550. They will mirror rootvg and are concerned about single points of failure. Which of the following features should be ordered？（）

A.Dual I/O planar， dual disk drives， dual SCSI adapters
B.Dual disk drive enclosures， dual disk drives， extra media bay
C.Dual disk drive enclosures， dual disk drives and dual SCSI adapters
D.Dual I/O planar， extra media bay， dual disk drives

单项选择题Following a system boot，the display indicates that previously detected hardware is missing.  Which of the following commands would identify the missing hardware？（）

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

单项选择题An administrator has a two-disk volume group （testvg） with one logical volume （testlv） which has just been mirrored across both disk drives. Which of the following commands can be used to turn off quorum？（）

A.chvg -Qn testvg
B.chlv -Qn testvg
C.varyoffvg testvg； varyonvg -Qn testvg
D.varyoffvg testvg； exportvg testvg； importvg -Qn testvg； varyonvg testvg

单项选择题An administrator has received complaints from users that an application is not available while other applications run. This application resides on an NFS mounted filesystem. Which of the following commands should be run as a reasonable first step to handle this problem？（）

A.df
B.showmount
C.exportfs
D.refresh -g nfs

单项选择题WhichactionchangesthedefaulteditorforALLusersonthesystemfromvitoedit？（）

A.Issue the command：export EDITOR=/usr/bin/edit edit each users .profile to change the EDITOR value to /usr/bin/edit
B.Modify /.profile and change the EDITOR variable to /usr/bin/edit
C.Modify /etc/environment and add EDITOR=/usr/bin/edit export EDITOR
D.Modify /etc/security/defaults and change the EDITOR value to /usr/bin/edit