I have two vCenters up and running, ESXi 5.0 and ESXi 5.5. Our existing environment is on 5.0 and 5.5 is a brand new environment I have built (we decided not to upgrade the existing environment for various reasons). I'm trying to figure out the best way to migrate all of our VM's (over 100) from 5.0 to 5.5 quickly and with the least amount of downtime and was wondering what others have done in the past. We have various workloads on these VM's (IIS, SQL, file servers etc.) and I'm open to any suggestions/ideas.
Thank you in advance!