VM migration from 5.5 to 6.7?

I have a 5.5 vCenter and newly build 6.7 vCenter
How could I migrate as many VMs gracefully without downtime from 5.5 to 6.7?

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  1. Totally depends on the version of the vSphere hosts (ESXi). Check upgrade paths for the highest version you can go to without causing any problems:


    Here’s a good guide for doing so:


  2. Depending on you configuration you might be able to simply add the hosts to the new vcenter if you’re starting fresh.

  3. Since vCenter 6.7 is incompatible with ESXi 5.5, I can’t think of a way to do it with no downtime. I’ve done similar using Veeam replication between the two and a planned failover but short of upgrading 5.5 to 6.0 first, I can’t think of any means of doing it live. Cross vCenter Migration fling requires 6.0u3. Maybe HCX if you have it available.

  4. I am don this right now, install the new infrastrutture with vmware 6.5, migrate and then upgrade. It is long bit if you can’t have downtime I think it is the best way.

  5. * How many hosts, of what versions?
    * What shared storage do you have?
    * What are your uptime requirements – can you have a 10 minute outage per vm? 30 minute?
    * How many vms do you have?
    * What spare capacity in terms of cpu/ram do you have?

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