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  • IO 相关指标

    vmstat:
    
    
       Swap
           si: Amount of memory swapped in from disk (/s).  
           so: Amount of memory swapped to disk (/s). 
    
    si: 每秒从交换区写到内存的大小
    so: 每秒写入交换区的内存大小
    
    iostat:
    
        tps
     Indicate  the number of transfers per second that were issued to the device. 
    
    A transfer is an I/O request to the device. Multiple logical requests can be com-bined into a single I/O request to the device. A transfer is of indeterminate size.
    
    
    意思是每秒对设备的I/O请求数量。 多个逻辑的请求可以合并成一个I/O请求。
    因为I/O一般是系统瓶颈。所以越大并不是越好。
    
    
    sar:
    
                  await
         The average time (in milliseconds) for I/O requests issued to the device to be served. This includes the time spent by the requests  in  queue  and  the  time
                         spent servicing them.
    
    ? await表示平均每次设备I/O操作的等待时间(以毫秒为单位)。
    

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  • 原文地址:https://www.cnblogs.com/hzcya1995/p/13351868.html
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