VMware
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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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:
[https://www.vmware.com/resources/compatibility/sim/interop_matrix.php#upgrade&solution=1](https://www.vmware.com/resources/compatibility/sim/interop_matrix.php#upgrade&solution=1)
Here’s a good guide for doing so:
[https://sivasankar.org/2018/1288/upgrading-migrating-from-vsphere-5-x-to-6-x-best-practices/](https://sivasankar.org/2018/1288/upgrading-migrating-from-vsphere-5-x-to-6-x-best-practices/)
Depending on you configuration you might be able to simply add the hosts to the new vcenter if you’re starting fresh.
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.
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.
* 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?