Upgrade RHEL5 to RHEL6 with XFS data partition

I am getting ready to upgrade our file server from RHEL5 to RHEL6 so I can resolve a 16 group limitation bug related to NFS.

See here: https://xkyle.com/solving-the-nfs-16-group-limit-problem/

I am curious if anybody has upgraded a system with an XFS filesystem from RHEL5 to RHEL6 and mounted the XFS filesystem okay in the new system.  I've done that before with ext3/4 partitions, but never XFS.  I just wanted to know if anybody has done it first since if something goes wrong, I get to spend like 3-4 days restoring 24TB from tape.

The current filesystem layout is below:

/           EXT3

/boot    EXT3

/exports/projects 26TB    XFS

/exports/analysis 100GB  XFS

Thanks,

Roy