Journaled filesystems and power failure

Posted by Yoga on Server Fault See other posts from Server Fault or by Yoga
Published on 2012-07-01T15:56:05Z Indexed on 2012/07/01 21:18 UTC
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I heard that even a journaled filesystems such as EXT3/EXT4 might corrupted during power failure, e.g. from wikipedia [1]:

In the event of a system crash or power failure, 
such file systems are quicker to bring back online and 
less likely to become corrupted.

Can anyone provide more detail by giving examples such that when

  1. corruption can occur
  2. corruption is avoided by journaled filesystems


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