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:
Nov. 15, 2011
Filed:
Jun. 19, 2008
Scott Schoenthal, San Ramon, CA (US);
Steven H. Rodrigues, Mountain View, CA (US);
Alan L. Rowe, San Jose, CA (US);
Joydeep Sen Sarma, Sunnyvale, CA (US);
Susan M. Coatney, Cupertino, CA (US);
Scott Schoenthal, San Ramon, CA (US);
Steven H. Rodrigues, Mountain View, CA (US);
Alan L. Rowe, San Jose, CA (US);
Joydeep sen Sarma, Sunnyvale, CA (US);
Susan M. Coatney, Cupertino, CA (US);
NetApp, Inc., Sunnyvale, CA (US);
Abstract
A data storage system has two computers. Each computer is assigned to a set of data. Two copies of each set of data are maintained. A first copy is stored on a first set of disks and a second copy is stored on a second set of disks. Each time that a data is written by a computer, a label is written to each set of disks, the label having fields for a status of each computer, a first ordinal which is increased each time that a new data is written, and a time stamp giving a time at which the last write was performed. After failure of a computer, a processor determines, in response to reading the labels of the first set of disks and the second set of disks, the most up to date copy of the data assigned to the failed computer.