Introduction to Storage Area Network (SAN) Jie Feng Winter 2001.

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Presentation transcript:

Introduction to Storage Area Network (SAN) Jie Feng Winter 2001

What is SAN about §Data is Asset §How to Store Data? §How to Access Data? §How to Manage Data Storage?

Evolution in Storage Architecture

Problem we are facing §Scalability --Rapidly growing data volume §Connectivity --Distributed data sharing §24/7 availability, no single point failure §High performance §Easy management

Server-Attached Storage (SAS)

SAS -- How to Share Data §Each has own copy l scalability: Poor l availability: OK l performance: OK l management: how to keep data sync? l Connectivity: NA §One copy, share l OK l single point failure l not that good l how to make back up without affecting service? l System dependent

Network-Attached Storage(NAS)

NAS §Scalability: good §Availability: as long as the LAN and NAS device work, generally good §Performance: limited by speed of LAN, traffic conflicts, inefficient protocol § Management: OK §Connection: homogeneous vs. heterogeneous

Storage Area Network (SAN)

§SAN is created by using the Fibre Channel to link peripheral devices such as disk storage and tape libraries

SAN vs. NAS §Dedicated Fibre Channel Network for Storage §More efficient protocol §==> higher availability §==> reduce traffic conflict §==> longer distance (up to 10 km)

Fibre Channel §provides high-performance, any-to-any interconnection. l server to server l server to storage l storage to storage §combines the characteristics of networks (large address space, scalability) and I/O channels (high speed, low latency, hardware error detection) together.

Benefits of SAN §Scalability ==> Fibre Channel networks allow the number of attached nodes to increase without loss of performance because as switches are added, switching capacity grows. The limitations on the number of attached devices typical of channel interconnection disappears.

Benefits of SAN §High Performance ==> Fibre Channel fabrics provide a switched 100Mbytes/second full duplex interconnect. §Storage Management ==> SAN-attached storage allows the entire investment in storage to be managed in a uniform way.

Benefits of SAN §Decoupling Servers and Storage l the servers can be upgraded while leaving storage in place. l Storage can be added at will and dynamically allocated to servers without downtime.

Easy Migration to SAN §Host Bus Adapters (HBAs) -- connect servers to the SAN §Fibre Channel storage -- connects directly to the SAN §SCSI-FC bridge -- allows SCSI (disk and tape) components to be attached to the SAN §SAN Network Components -- Fibre Channel switches

Summary §SAN is a high-speed network that allows the establishment of direct connection between storage devices and processors (servers) centralized to the extent supported by the distance of Fibre Channel.

Storage Area Network