单项选择题

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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热门试题

单项选择题Whichofthefollowingtoolsshouldbeusedtodisplaythelocationofunusedphysicalpartitionsonadiskdrive？（）

A. df -k
B. lsps
C. lslv -p
D. fileplace

单项选择题Whichofthefollowingcommandswillonlyprovideasnapshotofaveragememoryusageforaprocess？（）

A. vmtune
B. ps au
C. iostat
D. rmss -m

单项选择题Whichofthefollowingcommandsshouldbeusedtomonitorthenumberofthreadsonthescheduler’srunqueueforanygiveninterval？（）

A. sar
B. pstat
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单项选择题Whenmonitoringasystemusingvmstatwithaninterval，whichofthefollowingconclusionsshouldbedrawnaboutthemetricsunderpagepiandpagepo？（）

A. The values do not include working storage.
B. The values do not include persistent storage.
C. The values include both persistent and working storage.
D. The values are not working or persistent storage.

单项选择题To examine the Exhibit， press the Exhibit button. While a user is compiling a C program， vmstat 120 10 is run to determine the cause of a performance problem. Given the vmstat output as shown in the exhibit， which of the following conclusions is most appropriate to draw about the machine？（）

A. The machine has too many users.
B. The machine has an I/O bottleneck.
C. The machine has a CPU bottleneck.
D. The machine has a memory bottleneck.