Data storage system and method including data and checksum write staging storage
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United States of America Patent
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Aug 24, 1993
Grant Date -
N/A
app pub date -
Feb 1, 1991
filing date -
Feb 1, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An outboard data storage system for a data processing system including a plurality of data DASD's and a dedicated checksum DASD. Write commands and checksum data calculated from the write commands are placed in a staging area under the control of an intelligent controller, operating in parallel with the data processing system CPU, that acknowledges execution of write commands as they are staged. The controller blocks data with contiguous addresses into single write commands and queues the write commands in an order corresponding to physical DASD addresses. Fast reads are achieved by executing read commands directly from the staging storage area and DASD writes are reduced by preempting write commands in the staging storage area with new write commands having the same address.
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