单项选择题

Which of the following commands should be used to monitor disk utilization during the time a system is experiencing a disk I/O performance problem？（）

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

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单项选择题

After running the vmstat command， which of the following would most likely cause the value in the blocked column to be unusually high？（）

A. Kernel thread
B. Too many users
C. Memory shortage
D. Network contention

单项选择题

Which of the following commands is most useful in initially collecting data to determine a network performance problem？（）

A. ping
B. trace
C. ifconfig
D. lsattr

单项选择题

To examine the Exhibit， press the Exhibit button. While a user is compiling a C program， "vmstat 120 10" is run to determine the cause of a performance problem. Given the vmstat output as shown in the exhibit， which of the following conclusions should be drawn about the I/O bottleneck？（）

A. There is a file I/O bottleneck.
B. There are too many open files.
C. There appears to be a buffer shortage.
D. There is a paging space I/O bottleneck.