使用dd测试硬盘

深碍√TFBOYSˉ_ 2022-06-04 03:18 140阅读 0赞

声明：这只是本人个人的学习笔记，不做参考  
1.dd –help

[root@kubernetes-build bin]# dd --help
    用法：dd [操作数] ...
    　或：dd 选项
    Copy a file, converting and formatting according to the operands.
    
      bs=BYTES        read and write up to BYTES bytes at a time
      cbs=BYTES       convert BYTES bytes at a time
      conv=CONVS      convert the file as per the comma separated symbol list
      count=N         copy only N input blocks
      ibs=BYTES       read up to BYTES bytes at a time (default: 512)
      if=FILE         read from FILE instead of stdin
      iflag=FLAGS     read as per the comma separated symbol list
      obs=BYTES       write BYTES bytes at a time (default: 512)
      of=FILE         write to FILE instead of stdout
      oflag=FLAGS     write as per the comma separated symbol list
      seek=N          skip N obs-sized blocks at start of output
      skip=N          skip N ibs-sized blocks at start of input
      status=LEVEL    The LEVEL of information to print to stderr;
                      'none' suppresses everything but error messages,
                      'noxfer' suppresses the final transfer statistics,
                      'progress' shows periodic transfer statistics
    
    N and BYTES may be followed by the following multiplicative suffixes:
    c =1, w =2, b =512, kB =1000, K =1024, MB =1000*1000, M =1024*1024, xM =M
    GB =1000*1000*1000, G =1024*1024*1024, and so on for T, P, E, Z, Y.
    
    Each CONV symbol may be:
    
      ascii     from EBCDIC to ASCII
      ebcdic    from ASCII to EBCDIC
      ibm       from ASCII to alternate EBCDIC
      block     pad newline-terminated records with spaces to cbs-size
      unblock   replace trailing spaces in cbs-size records with newline
      lcase     change upper case to lower case
      ucase     change lower case to upper case
      sparse    try to seek rather than write the output for NUL input blocks
      swab      swap every pair of input bytes
      sync      pad every input block with NULs to ibs-size; when used
                with block or unblock, pad with spaces rather than NULs
      excl      fail if the output file already exists
      nocreat   do not create the output file
      notrunc   不截断输出文件
      noerror   读取数据发生错误后仍然继续
      fdatasync 结束前将输出文件数据写入磁盘
      fsync 类似上面，但是元数据也一同写入
    
    FLAG 符号可以是：
    
      append    追加模式(仅对输出有意义；隐含了conv=notrunc)
      direct    使用直接I/O 存取模式
      directory 除非是目录，否则 directory 失败
      dsync     使用同步I/O 存取模式
      sync      与上者类似，但同时也对元数据生效
      fullblock 为输入积累完整块(仅iflag)
      nonblock  使用无阻塞I/O 存取模式
      noatime   不更新存取时间
      nocache   丢弃缓存数据
      noctty    不根据文件指派控制终端
      nofollow  不跟随链接文件
      count_bytes  treat 'count=N' as a byte count (iflag only)
      skip_bytes  treat 'skip=N' as a byte count (iflag only)
      seek_bytes  treat 'seek=N' as a byte count (oflag only)
    
    Sending a USR1 signal to a running 'dd' process makes it
    print I/O statistics to standard error and then resume copying.
    
      $ dd if=/dev/zero of=/dev/null& pid=$!
      $ kill -USR1 $pid; sleep 1; kill $pid
      18335302+0 records in
      18335302+0 records out
      9387674624 bytes (9.4 GB) copied, 34.6279 seconds, 271 MB/s
    
    Options are:
    
          --help 显示此帮助信息并退出
          --version 显示版本信息并退出
    
    GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
    请向<http://translationproject.org/team/zh_CN.html> 报告dd 的翻译错误
    要获取完整文档，请运行：info coreutils 'dd invocation'

其中 if=”” 表示需要写入的文件路径 of=”” 输出的文件路径

example:

dd if="/dev/zero" of="/dev/sdd"

然后用工具iostat 对IO系统进行监控

iostat -x add 5 10