afaik, there's no way to do this 'in place'.

you'd need to boot into rescue mode, create the new XFS partition, copy the data across, then make the new partition live.

From: "Karthick K" <karthick.k11@gmail.com>
To: centos-virt@centos.org
Sent: Thursday, 28 June, 2012 1:47:26 PM
Subject: [CentOS-virt] Convert EXT3/EXT4 to XFS

Hi Folks,

Can you guide me about how to convert the CentOS file system from EXT3/EXT4 to XFS without loosing data? I have tried search in google about this but I couldn't get the relevant idea.

_______________________________________________
CentOS-virt mailing list
CentOS-virt@centos.org
http://lists.centos.org/mailman/listinfo/centos-virt