Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2005-02-08
2005-02-08
Beausoliel, Robert (Department: 2113)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C714S054000, C369S053350
Reexamination Certificate
active
06854071
ABSTRACT:
A table for identifying potentially bad location addresses based on prior knowledge and performing specific operations using the table data to ensure write recovery is disclosed. A Write Recovery Table (WRT) is provided, which consists of a list of LBAs requiring such special write recovery action so that a WRITE AND VERIFY command is issued instead of a WRITE command. If the WRITE AND VERIFY command fails, the RAID controller can issue a REASSIGN BLOCKS command for the bad block and re-issue the WRITE AND VERIFY command. If WRITE AND VERIFY commands are not supported, then the system can use a READ command with the “Force Unit Access” flag bit being set to “1” to verify the written data. Further, the WRT may be combined with Bad Data Table (BDT) to reject a Read Request from the host for a matched LBA (that is listed therein) because the data in the addressed block is known incorrect when a write recovery action is not warranted.
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King Allen
Lynch, Jr. Michael Attmer
Beausoliel Robert
Duncan Marc
Lynch David W.
Samodovitz Arthur J.
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