G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 13/20 (2006.01) G06F 12/08 (2006.01)
Patent
CA 2121852
ABSTRACT OF THE DISCLOSURE A data processing system is disclosed, which includes a processor having a processor memory and a mechanism for specifying an address that corresponds to a processor- requested data block located within another memory to be accessed by the processor. A hierarchical memory system is provided, which includes a cache and a long-term storage. In accordance with a mapping and meshing process performed by the memory subsystem, an address of a requested data block is translated to a second addressing scheme, and is meshed, so that proximate data blocks are placed on different physical target disks within the long-term storage. In accordance with a cache drain mechanism, the cache will drain data from the cache to the physical target disks, under different specified conditions, such as when it is determined that the storage control processor is idle and has not attempted to drain for a predetermined sleep time. A further mechanism is provided for preserving data within the cache that is frequently accessed by the requester processor. In this regard, recently accessed data buffers within the cache are placed at a most- recently-used location of a cache listing. Subsequent assignments of cache buffers, e.g., to physically read data from long-term storage into the cache, are preferably obtained from a portion of the cache listing that is remote from the most-recently-used location. A user-configuration mechanism is provided, which allows the user to define one or more user- configurable parameters which will control the access to the cache, and the transfer of data between the processor and the cache and between the cache and the long-term storage.
Perley-Robertson Hill & Mcdougall Llp
Sbc Technology Resources Inc.
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