Thanks for the sleuthing
I have started with the update, using cooker PLF, and there are some problems. A few seem related to MIB packages having a higher version number than the 2011 package from Mandriva. Trying to downgrade one or two at a time leads to other version-dependency problems. There is a warning that lib64rpm4 will have to be removed in order to install lib64rpm5 and there were a lot of growing pains reported on cooker during the transition to rpm5, so that's scary. How did you get around that? Then, 14G / has got too full for the installation/upgrade of 2000+ packages, urpmi seems to want to download all the rpms to disk before installing.
Anyway, I uninstalled a number of older/unused kernel packages and tried again. Watching packages downloading in MandivaUpdate and checking df periodically, I had to Ctrl-C as the ~375MB tetex something package was topping up /... I wonder if I can just remove that, don't use it, but some things have unexpected dependencies.
So, from a gparted livecd, I am trying to shrink the adjacent partition and grow / about 10G. That's been running all night and gparted (pretty amazing software

) reports about 5-1/2 more hours to go. The adjacent partition was almost 900G and, apparently, it takes some time to shift that many 0s and 1s 10G over.

Then, I'll try again.
Trying to work through the dead X of the installer for a fresh install is a fallback but I've got quite a few programs installed that are not rpm, not in the distro, require building or extraction from a tarball to /, so I'll try upgrade a little bit more.
