We are planning to upgrade 3 VMware v5.0 hosts to v5.1. We are planning to do this with no downtime. We will vmotion the guests to one of the 3 servers, shut that server down and then boot on a v5.1 CD and upgrade the boot device.
After server 1 is complete, we will need to use either vcenter 5.0 or vcenter 5.1 to manage a mixed environment so we can complete the other 2 hosts.
Can vcenter v5.1 manage the other 2 VMware hosts that will be v5.0? Obviously, we will need to do this to vmotion the guests from host 2 so we can shut it down and perform the same upgrade to v5.1 by booting to the CD and upgrading the boot device. We will have both vcenter 5.0 and 5.1 as we are not going to upgrade vcenter but install fresh on a new vcenter server already built and ready for vcenter 5.1 to be installed.