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Operations
that is a target of caching and remains before a full hit, the data is retained when
execution of the command is completed. This is done so that a new read-ahead
operation is not performed. If the full hit command is received during the read-
ahead operation, a transfer of the read requested data starts while the read-ahead
operation is in progress.
1) An example is the state shown below where the previous read command is
executing sequential reading. First, HAP is set at the location where hit data
is stored.
HAP end location of the previous read command
HAP
Cache data
2) The read requested data is transferred, and a new read-ahead operation is not
performed.
Cache data
6-18
HAP (It is reset to the hit data location for transfers.)
Full hit data
DAP end location of the previous read command
Full hit data
Cache data
HAP
(stop)
Cache data
DAP
C141-E245
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