2015年2月3日 星期二

[dd] Create a big file as fast as possible


dd of=bigfile count=0 bs=1M seek=8000


The command “stat bigfile “
stat bigfile 

  File: ‘bigfile’
  Size: 8388608000  Blocks: 0          IO Block: 4096   regular file
Device: 802h/2050d  Inode: 2757441     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ freeman)   Gid: ( 1000/ freeman)
Access: 2015-02-04 13:45:26.383469031 +0800
Modify: 2015-02-04 13:45:22.415468867 +0800
Change: 2015-02-04 13:45:22.415468867 +0800
 Birth: -


The real size will grow as much as read data gets written.
Reference:
1. Using dd as a Swiss Army knife

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