In private cloud, use datastore tiers to group hypervisor datastores and price them according to service levels.
When you use tiers, administrators or cloud users can choose the service level for VM hard disks at the level of VM templates, virtual datacenters, and VMs.
When you perform VM or storage moves outside of Abiquo, the platform will synchronize disks to their new datastore tiers.
If you do not enable datastore tiers feature, all datastore disks will be created in the "
Default Tier".
You can add datastores to a tier when you add a hypervisor to the platform, or from the Datastore tiers tab.
You can only add datastores to datastore tiers if they do not have any managed VM disks on them or if none of the disks are in a tier.
...