iowait
iowait-
A high iowait value can be an indication of a slow or overloaded disk .
iowait值高就意味着磁盘缓慢或负载过大。
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Percentage IOWAIT CPU Time Percentage IOWAIT time is the percentage of non-idle processor time spent waiting for I / O to complete .
PercentageIOWAITCPUTime（IOWAITCPU时间百分比）IOWAIT时间百分比是等待I/O完成所花费的非空闲处理器时间的百分比。
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Both vmstat and iostat report the percentage of time a system spends in iowait , meaning the CPU is idle but the system is waiting for IO to return .
vmstat和iostat报告系统在等待IO方面花费的时间百分比，也就是CPU空闲而系统正在等待IO返回的时间。