Disk scheduling in a multimedia I/O system
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)
Efficient guaranteed disk request scheduling with fahrrad
Proceedings of the 3rd ACM SIGOPS/EuroSys European Conference on Computer Systems 2008
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This (short) paper presents the Clockwise, a mixed-media file system. The primary goal of the Clockwise is to provide a storage architecture that supports the storage and retrieval of best-effort and real-time file system data. Clockwise provides an abstraction called a dynamic partition that groups lists of related (large) blocks on one or more disks. Dynamic partition can grow and shrink in size and reading or writing of dynamic partitions can be scheduled explicitly. With respect to scheduling, Clockwise uses a novel strategy to pre-calculate schedule slack time and it schedules best-effort requests before queued real-time requests in this slack time.