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When posting output use [code] tags, not [quote] tags.
If you want help, post sufficient detail - too much is better than not enough. If you're lucky, you won't need to alter partitions at all. Post all the output from the following
In future please don't add data to an earlier post - it makes the thread disjointed and confusing to others.
The messages about invalid partition are for the LVM components - they are logical entities, not real (physical) partitions. The messages are unfortunate and can be ignored.
So you have only one pv, so you don't need to mess with the physical partitions - what you want to do can be achieved by LVM commands. Redhat have a good LVM admin Guide you should download and read - it has walk-throughs for various scenarios incuding what you want to do.
Also this guide seems good - it shows how to reduce the filesystem first to ensure you don't lose data.
That guide is a bit behind the times. Both lvreduce and lvresize have a "-r" (--resizefs) option to resize the underlying filesystem, and it works with any filesystem supported by fsadm (ext2, ext3, ext4, ReiserFS, XFS).