Site Survey: Prep for Oracle Database Upgrade

Getting prepared to make trip to customer site to perform a Site Survey pursuant to an Upgrade from 11G to 12c.  What should be part of my Checklist with this Site Survey?  Important to mention this is a 2-node RAC database that early summer we plan to Upgrade to Oracle 12.2.  Customer is still processing their normal operations, so anything we allowed to do needs to be unobtrusive.  Additionally we probably will not be able to run the 12c Prerequisite script.  Any ideas/

Planning to check OS patches and the current database OPatches, exact database version, ASM version, etc..
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sdrussAuthor Commented:
Moderator please question.  Now OBE.

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