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Advances in SAN Technology

Advances in SAN Technology. Sverrir Rosario 4/24/07. Main Topics. Definition of a Storage Area Network (SAN) Traditional SAN Extension SAN Internetworking Intelligent Switches Supporting Storage Virtualization Intelligent Switches Supporting Replication / CDP Application.

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Advances in SAN Technology

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  1. Advances in SAN Technology Sverrir Rosario 4/24/07

  2. Main Topics • Definition of a Storage Area Network (SAN) • Traditional SAN Extension • SAN Internetworking • Intelligent Switches Supporting Storage Virtualization • Intelligent Switches Supporting Replication / CDP Application Sverrir Rosario - Advances in SAN Technology

  3. Definition of a SAN • A SAN is a dedicated network with high transfer rates. • A SAN provides infrastructure for building redundant, high-availability storage for groups of servers. • A SAN is a way to connect servers or clusters of servers to pools of data storage devices. • A SAN can connect over greater distances than are practical with conventional storage technologies. Sverrir Rosario - Advances in SAN Technology

  4. Traditional SAN Extension • Traditional SAN extension builds a single Fibre Channel fabric between two remote locations called an E_Port. • When connecting SANs together, two switches could have the same domain name so a principal switch must be selected to oversee the allocation of unique blocks of addresses to each switch. • Without the principal switch selection process duplicate addressing could occur resulting in the misrouting of data. • During the principal switch selection procedure, if a switch has to be renamed then each end device connected to the switch must re-login to the fabric to acquire new network addresses. Sverrir Rosario - Advances in SAN Technology

  5. Traditional SAN Extension Sverrir Rosario - Advances in SAN Technology

  6. SAN Internetworking • SAN internetworking is based on the Internet Fibre Channel Protocol (iFCP) and IP storage switches, which can eliminate fabric reconfiguration issues. • SAN internetworking provides interoperable E_Port connectivity to each local SAN fabric, but it terminates the E_Port connection at each site. • Now, each site remains a separate SAN and only authorized connections between storage devices and servers are allowed across the IP network. • This ensures that disruptions at one site will be isolated and not propagated to other locations Sverrir Rosario - Advances in SAN Technology

  7. SAN Internetworking Sverrir Rosario - Advances in SAN Technology

  8. Intelligent Switches Supporting Storage Virtualization • The main difference between an intelligent switch and a standard switch is the intelligent switch’s ability to perform deep packet inspections and its ability to perform specific operations on the packets passing though it. • When intelligent switches are not used any I/O from the host to the virtual storage will have to be handled by the Storage Virtualization Application running on a dedicated server, which translates the virtual address to a physical storage address before sending it to the respective storage application and thus overloading the server. • When the intelligent switch is used, the address translation and associated work can now be done by the intelligent switch. • This provides performance improvements and also makes the architecture more scalable. Sverrir Rosario - Advances in SAN Technology

  9. Intelligent Switches Supporting Storage Virtualization Sverrir Rosario - Advances in SAN Technology

  10. Intelligent Switches Supporting Replication / CDP Application • Efficient storage utilization, business continuity, and disaster recovery capabilities of an enterprise are addressed by deploying replication and continuous data protection (CDP) applications. • When used in combination with the replication applications, intelligent switches can improve the performance of data replication and eliminate the need for replication agents on individual hosts. • An intelligent switch replicates all write-I/Os, and a copy is sent to the CDP appliance and thus the host no longer requires a specific CDP agent, reducing the overall complexity of implementing a CDP solution. Sverrir Rosario - Advances in SAN Technology

  11. Intelligent Switches Supporting Replication / CDP Application Sverrir Rosario - Advances in SAN Technology

  12. Advances in SAN Technology Questions? Sverrir Rosario - Advances in SAN Technology

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