[ACS42][DISCUSS][FS] New Datamodel to map CloudStack Zone with VMware DC (1:1)

[sateesh chodapuneedi <ch...@gmail.com>]

Hi,

I would like to propose a feature around VMware hypervisor support, to map
CloudStack Zone with VMware DC in 1:1 fashion. Kindly go through the FS at
[1] and let me know your comments.



With this feature, VMware datacenter will be put under management of
CloudStack zone.



In previous releases, VMware datacenter is hidden behind a CloudStack
cluster, we need an explicit mapping policy for VMware datacenter both for
zone-wide storage and zone-wide network resources. 1:1 relationship between
VMware vSphere DC to CloudStack zone is a natural mapping from resource
point of view, whether it's storage (datastore) or network (distributed
switches etc.). Hence there is a need to move towards mapping a CloudStack
zone with single VMware datacenter to enable consistency in zone wide
features. In this explicit model, CloudStack will understand the
relationship between a VMware datacenter and resources underneath it, so
when resources like a VMware cluster is added to CloudStack, the underlying
VMware resource relationship between these objects will become constraint
information for CloudStack to use. For example, a VMware cluster can't be
added to a CloudStack zone if it's DC is not under the CloudStack zone. The
model itself will not limit how many VMware clusters/hosts that will be
managed, as long as those cluster/host are within the same DC.



Upgrade to new version (with this feature) does not enforce migration of
existing CloudStack zones. This means that if an existing zone has clusters
from multiple DCs/vCenters, it will be supported as-is. But zone wide
features would not be supported on such zone. To quote some, zone wide
primary storage, storage live migration across clusters in a zone which
might be added to CloudStack in future.



Regards,

Sateesh



[1]
https://cwiki.apache.org/confluence/display/CLOUDSTACK/Mapping+model+for+CloudStack+zone+and+Vmware+datacenter