I spent about 3 month trying to install cadence in alot of distributions (Suse 10.0, Suse 10.1, Fedora 6 , RHE 5.0 , ..)
I succeed to install it on Suse 10.0 with the instruction of Ahmed_abdulghany post but it was unstable and give some errors. :|
Then I update my system to RHE4 with the same installation I install under Suse 10.0 and it work well and very stable.
Note: I use the same installation by instal it on /usr/local/ and make it a drive alone as in the post and when I install RHE4, I mount /usr/local/ to the old one with tools.