单项选择题
Which of the following tools should be used to report in-depth information about file fragments？（）
A. defragfs
B. istat
C. filemon
D. fileplace
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A. svmon and tprof
B. vmtune and schedtune
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A. ifconfig ent0
B. entstat -d ent0
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Whenmonitoringasystemusing/usr/bin/vmstatwithaninterval，themetricsunderpagepiandpageporepresentwhichofthefollowingphrases？（）
A. The pages to and from paging space per second
B. The page intervals and page operations per second
C. The page interrupts and page operations per second
D. The page segments transferred between pi and po devices per second
