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. 13, 2002
Filed:
Jan. 14, 1999
Ramkrishna V. Prakash, Houston, TX (US);
William F. Whiteman, Cypress, TX (US);
Compaq Information Technologies Group, L.P., Houston, TX (US);
Abstract
A method and apparatus for reducing latency caused by cumulative point-to-point messaging associated with network performance monitoring in SAN-attached I O architectures. In a computer system, a performance monitoring OSM associated with a first node generates status request messages to a first multicast ISM residing on a first governor IOP associated with a first node for requesting the status from all nodes. The first multicast ISM generates status request messages to all node devices and node IOPs and to a second multicast ISM residing on a node governor IOP. The second multicast ISM generates status request messages to all node devices and node IOPs. One or more “unhealthy” device response messages may be sent to the performance monitoring OSM containing the TID of the “unhealthy” device to allow a subsequent point-to-point detailed status request message to be issued. For “healthy” nodes, a response message is issued to an adjacent governor IOP with an “all fine” indication and the TID set to the TID of the governor IOP. If all nodes in the network are “healthy”, an “all fine” indication is passed to the performance monitoring OSM with the TID set to the TID of the governor IOP of the performance monitoring node.