Which of the following tools is used to report the location of logical partitions of a file system on a physical volume？（）

单项选择题WhichofthefollowingcommandswillresetNFSoptionstotheirdefaults？（）

A. nfso -d
B. nfso -c
C. startsrc -g nfs -d
D. startsrc -g nfs -r

单项选择题To examine the Exhibit， press the Exhibit button. While a developer is compiling a C program，  vmstat 120 10  is run to determine the cause of a performance problem.  Using the vmstat output as shown in the exhibit， which of the following conclusions is most appropriate to draw about the machine？（）

A. The machine has too many users.
B. The machine has an I/O bottleneck.
C. The machine has a CPU bottleneck.
D. The machine has a memory bottleneck.

单项选择题Whichofthefollowingcommandsshouldbeusedtomonitorthenumberofbytesreadonanygivendisk？（）

A. tprof
B. topas
C. filemon
D. vmstat

单项选择题WhichofthefollowingstatementsisTRUEconcerningthepocolumnofthevmstatcommand？（）

A. The sys is high when po is high.
B. The po represents the number of page steals.
C. The low values usually indicate insufficient paging space.
D. The low values usually indicate sufficient memory for the load.

单项选择题Whilemonitoringasystemusingvmstat，whichofthefollowingoptionsmostlikelyindicatesthatthesystemisCPUbound？（）

A. r is greater than 40
B. id is greater than 50
C. sum of id and wa equals 50
D. sum of us and sy equals 100