Extending the number of domains in a Fibre Channel SAN
Publication Date: 2002-Jun-05
The IP.com Prior Art Database
Victor Gissin: INVENTOR [+3]
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
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
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
domains to appear in the global multi-site SAN. Local new Domain Identifiers are not...