Recording device having alternative recording units operated in three different conditions depending on activities in maintenance diagnosis mechanism and recording sections
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United States of America Patent
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-
Aug 5, 1997
Issued Date -
N/A
app pub date -
Feb 16, 1995
filing date -
Apr 11, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A recording device which improves a response time to write data by reporting to a host computer the completion of writing operation prior to the completion of writing redundancy data. Data writing command information from the host computer is stored in a command/status memory backed up by a power source in an array controller, and the completion of writing operation is reported to the host computer at the time of the completion of writing updated data prior to the completion of writing redundancy data. Redundancy data is written as a background process. If redundancy data could not be written due to any abnormality of the power source or the like, such redundancy data may be generated from the data in other disk units of the same redundancy group in accordance with writing command information stored in the command/status memory, thereby completing the writing of redundancy data.
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