Question about space requirements for FedUp

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http://forums.fedoraforum.org – I have on machine currently running Fedora 17. When I tried to use pre-upgrade to upgrade to Fedora 17 from Fedora 15 it failed because of space problems. So I installed Fedora 17 from a DVD as a fresh install. In its current configuration, it has 43 GB available in /, 352 MB in /boot and 141 GB in /home. I think the pre-upgrade problem may have arisen because of the limited space in /boot. Will FedUp have any problems upgrading to Fedora 18? Is there anyting I can do to avoid problems? I also have a large external USB drive attached to the machine. (HowTos)