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. 08, 2011
Filed:
Mar. 21, 2005
Augustine Amegadzie, Warren, NJ (US);
James T. Compton, Durham, NC (US);
Jerald W. Gross, Edison, NJ (US);
Stephen a Rago, Warren, NJ (US);
Christopher H. Stacey, Swindon, GB;
Eyal Zimran, Richmond, GB;
Augustine Amegadzie, Warren, NJ (US);
James T. Compton, Durham, NC (US);
Jerald W. Gross, Edison, NJ (US);
Stephen A Rago, Warren, NJ (US);
Christopher H. Stacey, Swindon, GB;
Eyal Zimran, Richmond, GB;
EMC Corporation, Hopkinton, MA (US);
Abstract
A hierarchical storage system is constructed from file servers and a policy engine server by building upon a file migration service. Offline attributes are added to file system inodes in a primary file server, file system parameters are added in the primary server, an offline read access method field is added to a connection database, and the primary file server is programmed to use these attributes and parameters for selecting a particular method (such as a partial read migration or a pass through read method) for read access to an offline file. In this fashion, the primary file server is provided with flexibility for selecting a particular one of a number of migration methods depending on various conditions, in order to improve the trade-off between the cost of storage and delay in file access.