Electrical computers and digital data processing systems: input/ – Input/output data processing – Peripheral monitoring
Reexamination Certificate
2011-03-29
2011-03-29
Peyton, Tammara (Department: 2182)
Electrical computers and digital data processing systems: input/
Input/output data processing
Peripheral monitoring
C710S014000, C710S016000, C710S017000, C710S018000, C710S019000, C714S043000, C714S047300, C714S049000
Reexamination Certificate
active
07917665
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 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.
REFERENCES:
patent: 5872932 (1999-02-01), Schettler et al.
patent: 7523359 (2009-04-01), Richards et al.
patent: 2008/0005621 (2008-01-01), Bedwani et al.
Booth Wayne
McGee Melvin
Klein O'Neill & Singh, LLP
NetApp, Inc.
Peyton Tammara
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