Convert Filesystem to Ext4

[Matt <lm7812@xxxxxxxxx>]

On a running 64 bit CentOS 5.6 box is it possible to convert from Ext3
to Ext4 to improve performance?  Right now I can deal with a few hours
of downtime on it.  This is an email server with lots of I/O due to
seek time.  Software RAID1 as well.  Will Ext4 offer much of an
improvement?
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