Upgrading a single node "Cluster" whilst live

[remr1n]

Were running a single node cluster on our DR site and we are planning to upgrade it to Ontap 9.3P12 from 9.3

I was searching how to do it online and came across the following KB

https://docs.netapp.com/ontap-9/index.jsp?topic=%2Fcom.netapp.doc.dot-cm-ug-rdg%2FGUID-B93B2383-9600-4535-971A-297DDA7564CD.html

Is the above KB enough to update the Ontap without any downtime?

Any insight on this matter will be more than appreciated!

[SpindleNinja]

Single node clusters require downtime (a reboot) to upgrade.   

check step 9 on the link you posted

- The node is rebooted as part of the update and cannot be accessed while rebooting.

note: I would pause any snapmirrors before you start the upgrade. 

[aborzenkov]

Obvious exception is two node metro cluster.