17ed3e0455
We still left lots of broken links in the docs, this change is to fix them. Change-Id: I4965489974ffa24e62f04fc1c995d1c7017e1291
35 lines
1.5 KiB
ReStructuredText
35 lines
1.5 KiB
ReStructuredText
.. _shared_file_systems_scheduling:
|
|
|
|
==========
|
|
Scheduling
|
|
==========
|
|
|
|
The Shared File Systems service uses a scheduler to provide unified
|
|
access for a variety of different types of shared file systems. 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. The
|
|
scheduler uses required and un-scoped extra-specs to look up
|
|
the shared service most suitable for a new share with the specified share type.
|
|
For more information about extra-specs and their type, see `Capabilities
|
|
and Extra-Specs <https://docs.openstack.org/manila/latest/admin
|
|
/capabilities_and_extra_specs.html>`_ section in developer documentation.
|
|
|
|
The general scheduler workflow:
|
|
|
|
#. Share services report information about their existing pool number, their
|
|
capacities, and their capabilities.
|
|
|
|
#. When a request on share creation arrives, the scheduler picks a service
|
|
and pool that best serves the request, using share type
|
|
filters and back end capabilities. If back end capabilities pass through,
|
|
all filters request the selected back end where the target pool resides.
|
|
|
|
#. The share driver receives a reply on the request status, and lets the
|
|
target pool serve the request as the scheduler instructs. The scoped
|
|
and un-scoped share types are available for the driver implementation
|
|
to use as needed.
|