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Method For Fastest-Path Discovery And Management In SAN Environment By Multipath-Driver

IP.com Disclosure Number: IPCOM000201810D
Publication Date: 2010-Nov-23
Document File: 3 page(s) / 46K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method is disclosed for enabling a multipath driver for discovering and managing multiple paths in storage area network (SAN) environment. Further, the method also enables the multipath driver to rank the multiple paths based on their speed characteristics and preferences of a user.

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Method For Fastest-Path Discovery And Management In SAN Environment By

Multipath-Driver

Disclosed is a method for enabling a multipath driver for discovering and managing multiple paths in storage area network (SAN) environment. Further, the method also enables the multipath driver to rank the multiple paths based on their speed characteristics and preferences of a user.

Fig. 1 illustrates method steps for identifying multiple paths and associated speed characteristic for each path between a source and a destination.

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Figure 1

The method involves employing extended link services such as FC Trace Route and Report Port Speed Capabilities (RPSC) for establishing speed characteristics associated with each path between a source and a destination. The FC Trace route is used to create a list of switches/ devices for each path from the source to the destination a frame passes through. The method analyses each switch/device in a path between the source and the destination. In case a device is a Nx port, it is established that FC trace route list for the path is completed and the method moves on the analyzing other paths.

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While analyzing each device in a path, the method involves employing RPSC for establishing speed characteristics associated with the path. The RPSC provide speed capabilities of all devices in the path from the source to the destination.

Information gathered by the FC trace route and the RPSC is stored in a database controlled by a device manager (DM). The DM applies a predetermined ranking algorithm for ranking paths based on, but is not limited to factors including fastest overall path speed, fewest hops, highest reliability or combination of any of these factors.

In an alternate embodiment, an echo or a similar command is used to clock speed as the echo command traverses t...