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:
Mar. 10, 2015
Filed:
Nov. 26, 2012
Symantec Corporation, Mountain View, CA (US);
Mukesh Bafna, Pune, IN;
Symantec Corporation, Mountain View, CA (US);
Abstract
Reservation conflicts are resolved in a clustering and storage system with SCSI-3 PR fencing enabled. For each specific node, all paths to shared storage are registered with a unique key. Only registered nodes can access the shared storage, and only one reservation can exist amidst multiple registrations. A command failure with a reservation conflict resulting from an attempt to access the shared storage is detected. In response, it is determined whether the specific node is registered with its unique key. If so, it is determined that the node is not fenced off from the shared storage, and the reservation conflict is to be resolved. To do so, the node is re-registered for all paths to the shared storage with the node's unique key. The failed command is then re-started. If the node is not registered, it is determined that the node is fenced off.