单项选择题
A. no
B. nfso
C. vmtune
D. exportfs
单项选择题 Whichofthefollowingcommandsdisplaysthenumberofsystemcallspersecondthatarebeingexecuted？（）
单项选择题 Whichofthefollowingcommandsshouldbeusedtoshowhowmuchdataisreadfromorwrittentoaparticularlogicalvolume，giventhereareseveralotherlogicalvolumesonthesamedisk？（）
单项选择题 WhichofthefollowingcommandsshouldbeusedtomonitordiskutilizationduringthetimeasystemisexperiencingadiskI/Operformanceproblem？（）