Datastore overprovisioning in Capacity-Aware Placement Advice overview
Use the Capacity Aware Placement Advice (CAPA) service to import data of datastore pools into the BMC Cloud Lifecycle Management infrastructure.
Overprovisioning of datastore elements is provided at the time of placement of a virtual disk, and must be defined as a percentage of the free space available on the target datastore.
Virtual datastore placement with overprovisioning
The overprovisioning setting in TrueSight Capacity Optimization is set as a:
- Global setting for all datastores
- Setting for a specific Datastore pool
- Setting for a specific datastore
The value of the overprovisioning is retrieved as the first non-null value of:
- Overprovisioning at the datastore level
- Overprovisioning at the datastore pool level
- Global overprovisioning
The Capacity-Aware Placement Advice service returns a different Return Status (error) code in each case to identify the exit status of the placement call. For more information, see Return Status (error) codes returned by the Capacity-Aware Placement Advice service.
After a successful placement, free datastore space is calculated by using the following formula:
freeAfterPlacement = freeBeforePlacement * ( 1 - (candidateSize / freeWithOverprovisioning) )
Where to go from here
To learn how to define datastore overprovisioning ratios at different levels in your cloud infrastructure, see: Viewing and configuring datastore overprovisioning