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Ext4 filesystem: convert or create?

Posted by HamRadio 
Ext4 filesystem: convert or create?
July 02, 2010 10:00AM

I'd like to convert my ext3 filesystem to ext4, so I've read this page.

Some doubts arise for me where it says that:

"All your existing files will continue using the old indirect mapping to map all the blocks of data. The online defrag tool will be able to migrate each one of those files to a extent format (using a ioctl that tells the filesystem to rewrite the file with the extent format; you can use it safely while you're using the filesystem normally)"

Does it means that my existing files will not be converted in the ext4 form (using its new extents) immediately after converting my filesystem?

Do I need to run some kind of command to have "the online defrag tool" accomplish the migration totally?

Should it be better to make a backup of my ext3 filesystem, create a new ext4 filesystem and then copy my files from the backup?

Thank you in advance for your answers.

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