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2.) Add the host but do not consider it for vm allocation until it is updated. if we are changing a non overcommit cluster to a overcommit cluster and if it has incapable hosts, we will allow them to be a part of the cluster but disable further allocation of VMs to these hosts until they are upgraded to have the overcommit capability.

Upgrade senario.

1.) Disable the overcommit feature in clusters existing before the upgrade. The admin should manually enable it, cloudstack will check the all the host for the overcommit capability and do the necessary.

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