Hello Ryan_CSULB, Do you mean actually perform an OneFS "upgrade" going from say v9.2.1_18 to v9.2.1_19 in order to do it per node? Yes that is correct. So patches are all-or-none for a cluster? Yes, when you apply a patch it is going to be applied to all nodes in the cluster.  
I recently patched firmware using the "--nodes-to-upgrade=" switch for the first time and it worked great.  I was able to do the firmware during business hours on nodes that had no SMB connections, move the SMB connections after-hours and complete the firmware the next business day, all without disruption.  I know you can also do an OneFS cluster upgrade in a similar fashion. Is there a similar mechanism for patches?  I would think yes but I haven't actually seen anything in the release notes for the latest patch I would like to install on v9.2.1.0 and all my searches come back to cluster upgrades for OneFS.  The documentation is very explicit for OneFS upgrades, have I just missed it somewhere for patching?
Question about Patching In Batches