SCHEDULING STORAGE ACCESSES FOR MULTIPLE CONTINUOUS MEDIA STREAMS

摘要

A system for scheduling storage accesses of multiple continuous media streams may include a plurality of media stream clients. Associated with each media stream client is one of a plurality of media stream managers. Each media stream manager maintains a ring of buffers configured to buffer media stream data between its associated media stream client and one or more storage systems. A different deadline queue may be associated with each one of the storage systems. Each deadline queue may be configured to queue buffer requests from the media stream managers. Each buffer request may include a deadline by which the buffer request must be fulfilled by the corresponding storage system. Each media stream manager may be configured so that once one of its buffers is consumed by the associated media stream client, the media stream manager submits a buffer request and deadline for that buffer to the appropriate deadline queue. Buffer requests may be ordered in each deadline queue from earliest to latest deadline. Each media stream manager may be configured to provide a guaranteed maximum media stream rate to its associated media stream client. The system may also include an admission controller configure to negotiate a maximum media stream rate with each media stream client. The admission controller may allow additional media stream clients only if negotiated maximum media stream rates can be maintained for all current media stream clients. The system may also include a bandwidth allocator that allocates bandwidth between guaranteed rate requests and non-rate-guaranteed requests.