upgrading ontap on active/active cluster

[#1]

I need to upgrade ontap to 8.0.2 on a 2 active/active filers.

what should I do to upgrade the filers first? will it take the volumes/aggr/luns offline? I cannot have them offline

[#2]

which version you are using now?

go to my autosupport and use the upgrade advisor to generate a procedure.

if you need non-disruptive, just select ndu.

and it is best to go thru this https://now.netapp.com/NOW/knowledge/docs/ontap/rel802/html/ontap/upgrade/frameset.html

thanks a lot