cto下载san基础培训文档legato公司.ppt

17 August 1999 Legato System Confidential Legato Confidential A Foundation for Understanding Storage Area Networks Objectives This training prepares students to: Use and understand basic SAN terminology Distinguish SAN from NAS and other storage network technologies Understand where SANs can help users the most Describe the configuration of SANs in the point-to-point, arbitrated loop, and switched fabric topologies Cite the performance gains available through use of SAN technology Recognize the distinguishing features of the main SAN products in today’s market Agenda Introduction to SANs SAN connectivity SAN components SAN applications What is a Storage Area Network? Why Give Storage Its Own Network? A good LAN does not make a good SAN ! LANs use different protocols, different tools LANs are physically insecure at the desktop and potentially vulnerable at the server LANs seldom have spare capacity for storage networking LANs are tuned to favor short, “bursty” user transmissions vs large, continuous data transfers SAN Storage RAID: “Redundant Array of Inexpensive Disks” Fault-tolerant grouping of disks that server sees as a single disk volume Combination of parity-checking, mirroring, striping Self-contained, manageable unit of storage JBOD: “Just a Bunch of Disks” Drives independently attached to the I/O channel Scaleable, but requires server to manage multiple volumes Do not provide protection in case of drive failure SAN Components Servers with host bus adapters Storage systems RAID JBOD Tape Optical Hubs and switches Bridges and extenders SAN management software Promise of SAN Massively extended scalability Greatly enhanced device connectivity Storage consolidation LAN-free backup Serverless (active-fabric) backup Server clustering Heterogeneous data sharing Disaster recovery - Remote mirroring Scalability and Performance Storage expansion No impact on servers Server expansion No impact on storage Load balancing Active parallel paths Bandw