Upgrading 10gR2 RAC to 11gR1 on RHEL 4

Steps to upgrade 10gR2 RAC on RHEL 4 to 11gR1 isn't much different to the previous post

1. Upgrade 10g version is 10.2.0.5 (with PSU 10.2.0.5.1)

2. As per metalink note for installing 11g on RHEL4 437123.1

Both RHEL AS/ES 4 "update 1" and "update 2" had a problem with the binutils RPM. This problem was not corrected until "update 3". Therefore, you MUST at least use the binutils RPM from "update 3" (or higher). The "update 3" version of the binutils RPM is binutils-2.15.92.0.2-18 (x86_64). Because of the two above problems, Oracle Global Support strongly recommends that you use Red Hat Enterprise Linux ES/AS 4 (update 3 or higher). This is kernel 2.6.9-34 or greater.

3. Make sure any additional rpms needed for 11g version are installed. Required rpms are listed on the above metalink note.

4. Do the additional pre-reqs that are not in 10g. Adding the following to /etc/profile is an example of such pre-reqs that weren't on 10g.

if [ $USER = "root" ]; then
         if [ $SHELL = "/bin/ksh" ]; then
                 ulimit -p 16384
                 ulimit -n 65536
         else
                ulimit -u 16384 -n 65536
         fi
fi

5. Do the rest of the upgrade same as on RHEL 5