System object

Hi,

I am trying to understand what exactly is a system object from AutoSupport Point of view. 

Does a 'system' mean [controller + RAM + CACHE(FP, FC) + DISKS] or [Controller + DISKS] or something else ? 

When you see IOPS - [nfs_ops, Cifs_ops ..] or [read_ops, write_ops, other_ops]  does it include ops being served from cache(if exists). 

I tried to match the ssd_data_read /write from system object with aggregate , but no match .

What exactly is system object ? what exact entities in storage solution is it trying to give you data for ?

is system object aggregated over all the volumes ?

I have read many articles, but I am kind of stuck on the fundamental thing.

Any pointer will be helpful. 

Thanks!