Yes, the system disk area is similar to the VNX one.
There are a lot of differences, but the system drives are still mirrored across the 4 initial drives.
The internal structure of the system drives isn’t documented customer facing.
If you have more than one system drive failed then you work with customer service to recover.
I got an alert saying system disk only have ten percent free space. This was during an upgrade on a brand new array with no luns configured
What does this mean