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In today's implementation, VMware DataCenter is invisible to CloudStack. CloudStack recognizes and manages cluster as resource container. There is no restriction on which DC or which vCenter instance over the cluster, that is being added to cloudstack zone, belongs to which DC or which vCenter instance. This implies following,
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To address these issues, Cloudstack should explicitly manage vSphere DCs. Treat CloudStack zone as capacity-planning and operating unit, in case of deployment with multiple DCs use multiple CloudStack zones configured one per DC and share the same network infrastructure, they only need to carefully allocate resources like IPs/VLANs etc. to multiple CloudStack zones to make it happen.
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