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显示自上次启动 CentOS 以来磁盘的 I/O 次数（读/写）

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显示自上次启动 CentOS 以来磁盘的 I/O 次数（读/写）

是否可以使用 iostat（或其他工具）来获取“自上次服务器重启以来”的读/写操作次数？

我的意思是：我需要知道服务器自上次启动以来完成了多少次读/写，而不是实时的。

谢谢！

答案1

有关数据量，请参阅iostat：

[root@example ~]# iostat -m
Linux 2.6.32-431.11.2.el6.x86_64 (example.com)  08/08/2014  _x86_64_    (2 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.38    0.00    4.10    0.36    0.10   95.07

Device:            tps    MB_read/s    MB_wrtn/s    MB_read    MB_wrtn
sda               0.95         0.01         0.01      68451      77290
vda              13.95         0.26         0.33    2871276    3572093
dm-0              1.93         0.01         0.01      64657      73426
dm-1             14.39         0.26         0.33    2871274    3572093

-m将以 MiB（而不是块）为单位显示输出，并且MB_read是MB_wrtn您正在寻找的数字。

对于 I/O 操作（请求）的总量，请参见/sys/block/$DEV/$PART/stat，例如/sys/block/sda/sda1/stat或/proc/diskstats，其解释如下（这是来自内核文档树)：

What:       /proc/diskstats
Date:       February 2008
Contact:    Jerome Marchand <[email protected]>
Description:
        The /proc/diskstats file displays the I/O statistics
        of block devices. Each line contains the following 14
        fields:
         1 - major number
         2 - minor mumber
         3 - device name
         4 - reads completed successfully
         5 - reads merged
         6 - sectors read
         7 - time spent reading (ms)
         8 - writes completed
         9 - writes merged
        10 - sectors written
        11 - time spent writing (ms)
        12 - I/Os currently in progress
        13 - time spent doing I/Os (ms)
        14 - weighted time spent doing I/Os (ms)
        For more details refer to Documentation/iostats.txt

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