Moving median usage frequency based maintenance of server instances

摘要

A framework for maintaining a plurality of server instances in batches to ensure continuity of service is described herein. In accordance with one aspect, quantities of the server instances are selected in an order based on a usage frequency of the server instances with respect to a median usage frequency of the plurality of server instances. The selected server instances may be logically quarantined for maintenance, one batch at a time. Each batch of server instances may be returned to service when the server instances of the batch are successfully maintained while logically quarantining a next batch of server instances.

主权项

1. One or more non-transitory computer-readable storage media comprising computer executable instructions that, when executed by a computer processor, direct the computer processor to perform operations including:
selecting a first server instance from a plurality of server instances, based on the first server instance having a usage frequency that is nearest to a median usage frequency of the plurality of server instances; logically quarantining the first server instance for maintenance; performing maintenance to the first server instance; when the first server instance is successfully maintained, determining a value by adding the median usage frequency of the plurality of server instances to a usage frequency of a batch of one or more other server instances, and selecting the batch for logical quarantine in response to nearness of the value to a preselected threshold; performing maintenance to the batch of one or more other server instances; when a threshold quantity of server instances has been successfully maintained, logically coupling the first server instance and the one or more other server instances into service and quarantining one or more remaining server instances; performing maintenance to the one or more remaining server instances; and when all server instances have been successfully serviced, logically coupling the one or more remaining server instances into service.