单项选择题
A. sar
B. lslv
C. iostat
D. filemon
单项选择题 WhichofthefollowingcommandsshouldbeusedtomonitordiskutilizationduringthetimeasystemisexperiencingadiskI/Operformanceproblem？（）
单项选择题 Afterrunningthevmstatcommand，whichofthefollowingwouldmostlikelycausethevalueintheblockedcolumntobeunusuallyhigh？（）
单项选择题 Whichofthefollowingcommandsismostusefulininitiallycollectingdatatodetermineanetworkperformanceproblem？（）