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Omneon
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Media Grid
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Content Director
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ContentDirectors manage and direct the overall operation of the Omneon MediaGrid. They enable clients to interact with the system by creating and presenting a single virtual file system constructed from MediaGrid's many individual ContentServer storage devices.
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All clients initially contact one of the clustered ContentDirectors for file access requests (e.g. open, read, write, etc.). The selected ContentDirector responds with a list of target Content- Servers for the transaction, enabling clients to then connect directly to a set of individual Content- Servers for data access.
During write operations, ContentDirectors determine the distribution of slices, which are the units of data stored across multiple ContentServers in a MediaGrid system. ContentDirectors use a heuristic algorithm weighing dynamic usage factors including ContentServer load and capacity to allocate slices to individual ContentServers. For subsequent read operations, this distribution enables the ContentDirector to actively load-balance the available storage and bandwidth of the system in order to ensure reliable, high-performance operation. With multiple ContentServers serving an individual client's read/write request, this approach eliminates any bandwidth bottlenecks commonly found in NAS storage systems that pass content through a single controller.
 Data Sheet, PDF
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