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The documentation covers this, here: Upgrading - BMC Discovery 11.3 - BMC Documentation
I would recommend the back and restore path, as that will set you up for future upgrades to already be using CENTOS 7. Discovery 11.3 is the last version that will support CENTOS 6.
Thank you. For some reason we don't want to go to CentOS 7.
I have seen the above URL, but was confused if we have to upgrade the appliance and OS separately. So, I assume the upgrade package for appliance itself will upgrade OS as well. No need to upgrade the OS separately.
Right, when you do the upgrade, you will land on CENTOS 6. There's not a separate OS upgrade path.