It is probably irrelevant but we are using ASM and there are 2 different storage systems underneath and SYSAUX is no a different storage system than the rest of the DB (or majority of it) but again, that shouldn't matter I'd have thought?
DB version is 18.104.22.168 but I can update it on a different DB residing on a different storage system(unmixed). Another point is that on the system where it does the update, it takes about 2-3 mins (normal) but on this system it comes back straight away (first time I thought : wow so fast because its on SSDs only to find out its cheating me :-) )
System Statistics: How to gather system stats for a particular batch of work [ID 427939.1]
Example of How To Gather and Display The Workload System Statistics into a User Defined Table [ID 1148577.1]