How it started
I've been delaying this PureDisk upgrade from 6.2 to 18.104.22.168.
There were simply many other tasks at my hands and also the upgrade did not simply look easy and it made me hesitate.
What if it goes wrong?
I thought "It will take too much time to create a full backup of the content router storage!" (well, later I found I did not have to do full content router backup anyway)
The most scray thing is that it's actually an OS upgrade and an application upgrade at the same time.
Both PDOS and PureDisk had to be upgraded together, on 3 nodes storage pool - SPA and MBE and CR.
I was telling myself, later I will do it, later I will do it ... and that "later" finally came.
Some other project was adding 3 more nodes (MBE CR CR) in to this storage pool and I had to upgrade existing pool before I add those 3 in.
What goes wrong comes wrong