Rolling capacity upgrade control

A computer-implemented method, comprising:

• receiving an upgrade request input indicative of a request to deploy computing resources in a target server farm;
• based on an increment indicator that indicates an increment of a source server farm to be upgraded at a given time, identify a fixed increment of the computing resources to be removed from the source server farm and deployed in the target server farm,
• wherein the fixed increment of the computing resources is less than a final resource capacity and is identified independently of a workload level on a source server farm;
• removing the fixed increment of computing resources from the source server farm, including one or more virtual machines on the source server farm, by:
• reducing a resource capacity goal corresponding to the source server farm, and
• deploying the fixed increment of computing resources to the target server farm;
• and
• based on deploying the fixed increment of computing resources to the target server farm, determining whether the target server farm has deployed adequate resource capacity to service a fixed increment of databases;
• if the target server farm has deployed adequate resource capacity to service the fixed increment of databases, moving the fixed increment of databases from the source server farm to the target server farm, and
• if the target server farm has not deployed adequate resource capacity to service the fixed increment of databases, assigning additional computing resources from the source server farm to the target server farm by further reducing the resource capacity goal.

A computing system for controlling deployment of computing resources, the computing system comprising:

• a processor;
• and
• memory storing instructions executable by the processor, wherein the instructions, when executed by the processor, configure the computing system to provide:
• a request router configured to:
• route a service request for a tenant in a source server farm to computing resources in the source server farm;
• an upgrade controller configured to:
• receive an upgrade request input indicative of a request to deploy computing resources in a target server farm, and
• based on an incremental indicator that indicates an increment of the source server farm to be upgraded at a given time, identify a fixed increment of the computing resources in the source server farm, as a fractional part of the set of request routers, to be deployed in a target server farm;
• a goal processing component configured to;
• identify a resource capacity goal corresponding to the source server farm;
• a resource capacity reassignment component configured to:
• release the fixed increment of computing resources from the source server farm, including one or more virtual machines on the source server farm, by reducing the resource capacity goal and deploying the fractional part of the request routers to the target server farm;
• and
• a database move component configured to:
• in response to a determination that the target server farm is deployed inadequate resource capacity to service a fixed increment of databases, provide a call to the resource capacity reassignment component to release an additional fixed increment of computing resources, including an additional fractional part of the request routers, from the source server farm to the target server farm by further reducing the resource capacity goal.