The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 17, 2007
Filed:
Oct. 15, 2003
Paresh Chatterjee, Fremont, CA (US);
Basavaraj Gurupadappa Hallyal, Fremont, CA (US);
Senthil Murugan Thangaraj, Fremont, CA (US);
Narasimhulu Dharanikumar Kotte, Fremont, CA (US);
Ramya Subramanian, Fremont, CA (US);
Paresh Chatterjee, Fremont, CA (US);
Basavaraj Gurupadappa Hallyal, Fremont, CA (US);
Senthil Murugan Thangaraj, Fremont, CA (US);
Narasimhulu Dharanikumar Kotte, Fremont, CA (US);
Ramya Subramanian, Fremont, CA (US);
LSI Logic Corporation, Milpitas, CA (US);
Abstract
A mechanism is provided for migration between stripe storage and redundant parity striped storage. When a disk is added to a disk array, the mechanism migrates from RAID 0 to RAID 5. For each row, the mechanism calculates parity for the row and, if the parity position is not the new drive, the mechanism writes the data from the parity position to the new drive and writes the parity to the parity stripe position. If a drive fails, the mechanism migrates back from RAID 5 to RAID 0. For each row, if the parity position is not the failed drive, reads the data from remaining drives, XORs the data stripes to get failed drive data, and writes the failed drive data to the parity position. If a read or write is received for the failed drive, the mechanism simply redirects the read or write to the parity position.