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:
Jan. 03, 2012
Filed:
Mar. 29, 2011
Wayne Booth, San Jose, CA (US);
Melvin Mcgee, Gilroy, CA (US);
Wayne Booth, San Jose, CA (US);
Melvin McGee, Gilroy, CA (US);
Netapp, Inc., Sunnyvale, CA (US);
Abstract
Method and system is provided where PHY state change (PHY CHANGE) notifications from one or more PHYs in a storage infrastructure are monitored as a potential error condition. The rate of PHY CHANGE notifications is monitored to determine if the rate of PHY CHANGE notifications may cause a loss of service or degrade I/O performance. An excessive rate of PHY CHANGE notification that may cause a loss of service is detected by comparing a current PHY CHANGE count with a burst threshold value. The current PHY CHANGE count is also compared to an operational threshold value to detect if the rate of PHY CHANGE notification may result in degradation of overall I/O performance. If the PHY CHANGE count for a PHY equals or exceeds the burst threshold value or the operational threshold value, then the PHY is disabled.