does ELM support three sites?

[allenlaiyang]

hi experts,

is it possible to have three vCenter in HA mode to have ELM enabled each other?

if so, how the json file configure looks like, what will be filled for the replication_partner_hostname field ?

Thanks

Allen

[Mark Edwards]

 - yes it is. We run 3 vCenters in ELM mode with a vCenter in each site.

 

We also used VCHA when we were on 6.7 (so 9 VMs in total), which I guess is the answer to your question, but we removed VCHA when we replatformed to vSphere 7.0.

 

HTH 

[allenlaiyang]

should the json file for the json file site2 be like

"first_instance": false,

 "replication_partner_hostname": "vcenter_1","vcenter_3"

and site3 like

"first_instance": false,

 "replication_partner_hostname": "vcenter_1","vcenter_2"

thanks a lot

[Mark Edwards]

That will work, but whilst you've got a replication agreement for VC1 > VC2 and VC1 to VC3, its best practise to have an agreement between VC2 > VC3 as well. Also known as a 3 way ring topology. 

This is what we were advised to do during a call with VMware support whilst we were looking at another issue.

 

If it helps, here's a link to the guide we used to do this:

https://make-it-work.net/2022/01/vsphere-sso-domain-replication-topology/

 

HTH