Yes they are 2 major revisions.  since you are at R28 and you want to go to R30, you would need to upgrade one side of your mirror to R29, then the other side to R29.  Then do the same for R30.  Doing it this way, you shouldnt have to admin fracture the mirrors.  It will take a bunch of time.  your loking at around 1 hour per upgrade X 4
Hi  i have two cx4-120 arrays that are set up with async mirror over wan link, they are both running flare 28.8 and i am in process of upgrading them to flare 30, i have heard that you dont have to fracture the mirror if flares are 1 revision apart, is flare 28 and 29 two different major revisions? so do i have to break the mirrors before i upgrade?  BR  Ingvar
upgrade flare 28 to flare 30