I am about to upgrade the RHEL version from RHEL 5.4 to RHEL 6.3 in a few hundreds of production servers.
The upgrade will be tested on a staging environment on virtual machines before production deployment.
Are there any backward-compatibility issues with RHEL upgrades?
Answer
I wouldn't run the upgrade process this way if you're planning to perform in-place transitions from EL5 to EL6. It's not an easy or clean process.
See: Why is it so difficult to upgrade between major versions of Red Hat and CentOS? and Upgrade CentOS 5.x to CentOS 6.x - tips and techniques
However, you have the right idea of testing this in a limited-capacity first.
Regardless of deployment technique, the biggest issues I saw in moving from EL5 to EL6 were:
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