使用dd测试硬盘

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 statisticsN 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 =MGB =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 itprint 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/sOptions 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