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Mixed 5.1 and 5.5 in Same Cluster

I have a 4 node ESXi HA cluster. 3 of them are on 5.1 and I upgraded 1 of them to 5.5 in order to attempt to resolve an issue.  I wanted to hold off on upgrading the other hosts to 5.5 until the U1 update in January.  Are there any issues running a mix of 5.1 and 5.5 hosts in the same DRM/HA cluster?
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garyttu
Asked:
garyttu
2 Solutions
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
There are no issues in mixing host versions, as long as you maintain a baseline of Virtual Machine now greater than version 10 across your Cluster!

So, WARN ALL VMware Admins NOT TO:-

1. Update VMware Tools
2. Upgrade Virtual Machine hardware.

otherwise those VMs will only run on ESXi 5.5!

until all hosts are at 5.5!
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James HIT DirectorCommented:
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