单项选择题

Which of the following commands should be used to monitor the number of bytes read on any given disk?()

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

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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

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