Which iostat %iowait minimum threshold indicates a possible I/O bottleneck?()
A、20%
B、40%
C、60%
D、80%
A、20%
B、40%
C、60%
D、80%
A、 foo ; lsps -s B、 tprof -kx ; foo C、 iostat ; foo ; iostat D、 vmstat -s ; foo ; vmstat s
A、 The iostat can only be run as the root user B、 There could be zero percent I/O wait and still be an I/O bottleneck C、 Any I/O wait time displayed in output of "iostat" is an indication of severe I/O bottlenecks D、 Running "iostat" without any arguments/parameters is sufficient for resolving I/O bottlenecks