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Scheduling
The Shared File Systems service provides unified access for a variety of different types of shared file systems. To achieve this, the Shared File Systems service uses a scheduler. The scheduler collects information from the active shared services and makes decisions such as what shared services will be used to create a new share. To manage this process, the Shared File Systems service provides Share types API.
A share type is a list from key-value pairs called extra-specs. Some of them, called required and un-scoped extra-specs, the scheduler uses for lookup of the shared service suitable for a new share with the specified share type. For more information about extra-specs and their type, see Capabilities and Extra-Specs section in developer documentation.
The general scheduler workflow is described below.
- Share services report information about the number of existing pools, their capacities and capabilities.
- When a request on share creation comes in, the scheduler picks a service and pool that fits the need best to serve the request, using share type filters and back end capabilities. If back end capabilities pass through, all filters request to the selected back end where the target pool resides.
- The share driver gets the message and lets the target pool serve the request as the scheduler instructs. The scoped and un-scoped share type extra-specs are available for the driver implementation to use as needed.