单项选择题
Which of the following commands should be used to determine which disk of a system is experiencing a disk I/O performance problem？（）
A. filemon B. istat C. vmstat D. iostat
单项选择题 Whichofthefollowingcommandscanbeusedtocleanupafailedsoftwareinstallationprocess？（）
单项选择题 Whichofthefollowingcommandscanbeusedtoreviewthesystemerrorlogs？（）
单项选择题 ServiceLevelAgreements（SLA）typicallydonotaddress（）
