单项选择题
A. no
B. chdev
C. vmtune
D. schedtune
单项选择题 Whichofthefollowingcommandsshouldbeusedtoviewandchangethenetworkfilesystemtuningparametersavailableonthesystem？（）
单项选择题 Whichofthefollowingcommandsdisplaysthenumberofsystemcallspersecondthatarebeingexecuted？（）
单项选择题 Whichofthefollowingcommandsshouldbeusedtoshowhowmuchdataisreadfromorwrittentoaparticularlogicalvolume，giventhereareseveralotherlogicalvolumesonthesamedisk？（）