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This paper presents a performance comparison of several file system
allocation policies. The file systems are designed to provide high
bandwidth between disks and main memory by taking advantage of
parallelism in an underlying disk array, cateringv to large units
of transfer, and minimizing the bandwidth dedicated to the transfer
of meta data. All of the file systems described use a multiblock
allocation strategy that allows both large and small files to be
allocated efficiently. Simulation results show that these multiblock
policies result in systems that are able to utilize a large percentage
of the underlying disk bandwidth; more than 90% in sequential cases.
As general purpose systems are called upon to support more data
intensive applications such as databases and supercomputing, these
policies offer an opportunity to provide superior performance to a
larger class of users.
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