Linked by Thom Holwerda on Mon 9th Mar 2009 23:24 UTC
Linux Ext4 is the latest in a long line of Linux file systems, and it's likely to be as important and popular as its predecessors. As a Linux system administrator, you should be aware of the advantages, disadvantages, and basic steps for migrating to ext4. This article explains when to adopt ext4, how to adapt traditional file system maintenance tool usage to ext4, and how to get the most out of the file system.
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Better howto
by kev009 on Tue 10th Mar 2009 02:52 UTC
kev009
Member since:
2006-11-30

http://www.kev009.com/wp/2008/12/how-to-upgrade-to-ext4-in-place/

Read comments as well.

With 2.6.29 or an up to date stable (2.6.27/28) I see no reason not to use ext4 on new FS. Upgrading is a bit precarious, so you might want to try the process on a loop file or spare FS to get comfortable but I have done it on several machines without incident. The initial fsck messages may be a bit nerve racking depending on what features you change, but it should sort out. The biggest gotcha with Fedora was regenerating the initrd. On my module-less Gentoo servers, it was a bit easier.

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