Browse Prior Art Database

Extending the number of domains in a Fibre Channel SAN

IP.com Disclosure Number: IPCOM000008324D
Publication Date: 2002-Jun-05
Document File: 4 page(s) / 143K

Publishing Venue

The IP.com Prior Art Database

Related People

Victor Gissin: INVENTOR [+3]

Related Documents

09/901/661: PATAPP

Abstract

Disclosed is a method for extending the possible number of domains in a Fibre Channel SAN. Benefits include: 1. Deployment of biglarge, multi-site SANs, with hundreds of domains 2. Localized independent management of distributed sites

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 50% of the total text.

Page 1 of 4

Extending the Number of Domains in a Fibre Channel SAN

Disclosed is a method for extending the possible number of domains in a Fibre Channel SAN. Benefits include:

1. Deployment of large, multi-site SANs, with thousands of domains
2. Localized independent management of distributed sites

Description

     The following is an explanation, based on a patent pending technique of SANcastle Technologies Inc., of compressing the 24-bit Fibre Channel address field so that is invisible to the standard Fibre Channel domains, thereby extending the possible number of domains in a Fibre Channel SAN. Benefits include:

• Deployment of big, multi-site SAN, with thousands of domains

• Localized, independent management of distributed sites

    Fibre Channel addressing is hierarchical and is comprised of three bytes: Domain, Area, and Port. This hierarchical structure limits the number of domains (i.e. switches) to 239. Because domains have a small number of ports (between 8 to 256), this addressing scheme is not practicably scalable to a SAN with thousands of ports. Domain Identifiers in the Fibre Channel standard are required to be unique, thereby introducing a management problem for multi-site SANs. In a worldwide enterprise, each site has its own SAN manager. The SAN manager needs to be able to perform local topological changes without endangering the integrity of the global SAN.

    SANcastle has developed a 2-tier architecture and addressing scheme that allows integration of distributed sites while protecting the integrity of the interconnected fabric. The distributed sites are connected via gateways and each gateway appears locally as the only domain attached to all non-local devices. In addition, each gateway appears to the other gateways as the only domain attached to all local devices. The total possible number of edge ports in this design is approximately 64K. Because the local Domain Identifiers are not used outside the local SAN, they need be unique only at the local SAN, allowing many more than 239

©SANcastle Technologies, Inc. 2002

[This page contains 1 picture or other non-text object]

Page 2 of 4

domains to appear in the global multi-site SAN. Local new Domain Identifiers are not...