I've had a XEN VM with a 90GB disk, increased it to 250GB.
Then I had the problem that I used GPT partitioning, meaning only
"parted" being usable. parted doesn't support resizing partitions for
xfs and refuses to do it.
The simple thing is to delete and recreate with bigger size that
partition. Later mount the partition and run xfs_growfs.
I don't understand why parted doesn't support that, just resizing the
partition and not refusing it. :-(