The df command indicates that a filesystem is full， however， the du command indicates that not all space is allocated. 
How would the system administrator isolate the discrepancy（）

单项选择题everal people in an finance customer IT department are asking for fileset updates that the  system administrator received from IBM earlier that day on CD-ROM. The system administrator created an install directory on their machine and made it available to everyone.  Which of the following commands will allow the system administrator to copy the images from an IBM update CD-ROM to the install directory（）

A."smit bffcreate" from the target directory
B."tar -xvf /dev/cd0" from the target directory
C."restore -xvqf /dev/cd0" from the target directory
D.mount the cdrom on /cdrom and run "cp /cdrom/* ." from the target directory

单项选择题Because of performance problems， capacity needs to be added to a paging space named  paging01 on hdisk1. The physical partition size of hdisk1 is 4MB.  Which command will increase the size of paging01 by 100MB（）

A.chlv -a paging01 25
B.chps -s 25 paging01
C.mkps -a 25 paging01
D.extendlv -a paging01 25

单项选择题A System p administrator needs to upgrade a system from AIX 5.2 to AIX 5.3.  Which of the following installation methods would minimize downtime（）

A.Migration installation
B.Partition Mobility
C.alt_disk_install
D.update_all smit fastpath and reboot during the next scheduled outage

单项选择题An administrator attempted to run a sar -u report and received the following error： sar： 0551-201 Cannot open  var adm sa sa12.  Which of the following should be scheduled in adm’s crontab to enable sar reporting（）

A.sar
B.sa1
C.vmo
D.iostat

单项选择题A banking user with the userid of ’joe’ is unable to rsh from SYSTEMA to SYSTEMB without having to retype their password， but they can rsh from SYSTEMB to SYSTEMA. No other users are experiencing the same issue.  Both systems have a  home joe .rhosts file that contain the proper references to the other host. The  home joe .rhosts files on both SYSTEMA and SYSTEMB are owned by userid ’joe’.  Which of the following is the most likely cause of this problem（）

A.User ’joe’ is specified in the /etc/nologin on SYSTEMb.
B.User ’joe’ is specified in the /etc/nologin on SYSTEMa.
C.The file permissions on the /home/joe/.rhosts file on SYSTEMA are incorrect.
D.The file permissions on the /home/joe/.rhosts file on SYSTEMB are incorrect.