单选题Which of the following phrases is TRUE regarding monitoring disk I/O with iostat？（）A The iostat can only be run as the root userB There could be zero percent I/O wait and still be an I/O bottleneckC 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
单选题
Which of the following phrases is TRUE regarding monitoring disk I/O with iostat？（）
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
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