Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2005-07-30
2008-09-30
Verbrugge, Kevin (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S170000
Reexamination Certificate
active
07430635
ABSTRACT:
Methods and structure for improved import/export of RAID level 6 logical volumes in subsystems supporting RAID level 5 but not level 6. When a RAID level 6 logical volume is imported into a RAID level 5 storage subsystem, features and aspects hereof re-map the logical volume for use as a RAID level 5 logical volume. Disk blocks containing the level 6 additional redundancy information are not used by the RAID level 5 storage subsystem but are skipped in the re-mapping of the logical volume. All other blocks of the logical volume are mapped to corresponding blocks of the RAID level 6 mapping of the logical volume. The logical volume may then be flagged to indicate the additional redundancy information is invalid. A RAID level 6 storage subsystem may then rebuild the additional redundancy information when the flagged logical volume is re-imported to a RAID level 6 storage subsystem.
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Hetrick William A.
Nichols Charles E.
Duft Bornsen & Fishman LLP
LSI Corporation
Verbrugge Kevin
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