IBM hardware support has just replaced a disk， and commented that the system administrator might want to remove the "DISK OPERATION ERROR" from the error report. 
Which of the following commands is used to delete the "DISK OPERATION ERROR" from the following error report（）
IDENTIFIER TIMESTAMP T C RESOURCE_NAME DESCRIPTION F89FB899 0616150005 P O dumpcheck The copy directory is too small. 5DFED6F1 0616075205 I O SYSPFS UNABLE TO ALLOCATE SPACE IN FILE SYSTEM AA8AB241 0615153905 T O OPERATOR OPERATOR NOTIFICATION 35BFC499 0412130605 P H hdisk6 DISK OPERATION ERROR 91FBD5DB 0525045805 P S ssa1 SOFTWARE PROGRAM ERROR 05F97A32 0525045805 P H ssa1 ADAPTER ERROR

单项选择题While using the smit install_remove menus to remove some filesets on an AIX 5.3 server， a system administrator notices the  usr filesystem is now unnecessarily large.  Which of the following actions will reduce the size of the  usr filesystem （）

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 n /usr commands.
D.Update the /image.data file with the desired size for /usr and reboot the system.

单项选择题Given the following script， why does the output come out as an empty line instead of  dog （）#! bin ksh  $VAR=dog  echo  ${VAR}

A.The $VAR variable was not exported.
B.The $VAR should have been set as VAR.
C.dog needs double quotes around it when setting $VAR.
D.The { } should not be around VAR in the echo command.

单项选择题Whichofthefollowingcommandswouldanadministratorusetoaddstartupscriptstothesystemstartupprocess（）

A.chitab
B.vi /etc/inittab
C.vi /etc/rc.d
D.mkitab

单项选择题Using splitvg to create a snapshot volume group of rootvg results in an error.  What is the most likely cause of the error（）

A.There is not an available disk to allocate to the snapshot volume group
B.One of the physical volumes associated with rootvg has a status of "missing"
C.Rootvg is running in enhanced concurrent mode
D.A snapshot volume group cannot be created for the rootvg

单项选择题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（）

A.Use the fuser command to identify deleted but open files.
B.Use the ipcs command to view orphan shared memory segments.
C.Use the defrag command to determine if the filesystem is fragmented.
D.Use the topas command to identify processes using the most system resources.