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yum (PackageKit) will download packages to /var before installing.
Especially when using preupgrade, all packages to be upgraded (F12 -> F13) will be first downloaded to /var/cache/yum
Someone may know how much space is needed to for example hold all F12 packages currently.
I used to have also separate partitions (under LVM though) for different main directories, but it was just too much trouble and nowadays I just have / and /boot, where / is crypted and under LVM, so I may make it bigger with another harddisc some day.
It would make some sense to have /usr as separate partition and have it read only. Also /home would have noexec-flag in it and so on, to make system more secure. But it gets too much trouble to then make updates (at least automatically) and it is difficult to predict how much space is needed in the future for different main directories.
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