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Asynchronous disk interleaving: approximating access delays

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2 Author(s)
Kim, M.Y. ; IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA ; Tantawi, A.N.

The performance implications of asynchronous disk interleaving are examined. In an asynchronous system, adjacent subblocks are placed independently of each other. Since each of the disks in such a system is treated independently while being accessed as a group, the access delay of a request for a data block in an n-disk system is the maximum of n access delays. Using approximate analysis, a simple expression for the expected value of such a maximum delay is obtained. The analysis approximation is verified by simulation using trace data; the relative error is found to be at most 6%

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Computers, IEEE Transactions on  (Volume:40 ,  Issue: 7 )