Limiting modification of cache entries in a write-back cache based upon the amount of dirty lines in the cache
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United States of America Patent
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Apr 22, 1997
Issued Date -
N/A
app pub date -
Feb 3, 1995
filing date -
Feb 20, 1991
priority date (Note) -
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Abstract
In allocating an area of a cache memory to each storage unit, proper allocation of the cache memory is made to each storage unit. If the amount of write-after data becomes equal to or more than a threshold value, an allocation limit is set to each disk unit. If CPU issues a data write request requiring the amount of data equal to or more than the allocation limit, the data write request is held in a wait state until the amount of write-after data becomes less than the allocation limit. Therefore, the allocation amount to the disk unit becomes neither too large nor too small. In this manner, proper allocation of the cache memory to each disk unit can be realized.
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