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:
Aug. 16, 2011
Filed:
Apr. 27, 2007
Abhijeet P. Gole, San Jose, CA (US);
Andrew E. Dunn, San Jose, CA (US);
Prasanna K. Malaiyandi, San Jose, CA (US);
Shane S. Owara, Sunnyvale, CA (US);
Abhijeet P. Gole, San Jose, CA (US);
Andrew E. Dunn, San Jose, CA (US);
Prasanna K. Malaiyandi, San Jose, CA (US);
Shane S. Owara, Sunnyvale, CA (US);
Network Appliance, Inc., Sunnyvale, CA (US);
Abstract
An apparatus and a method to eliminate deadlock in a bi-directionally mirrored data storage system are presented. In some embodiments, a first and a second storage servers have established a mirroring relationship. To prevent deadlock between the storage servers and to reduce write latency, the second storage server may hold data received from the first storage server in a replication queue and send an early confirmation to the first storage server before writing the data to a destination volume if the first storage server is held up due to a lack of confirmation. In another embodiment, when the first storage server writes metadata of a persistent point-in-time image (PPI) to the second storage server, the second storage server may send a confirmation to the first storage server after copying the metadata, but before exporting the PPI at the second storage server.