CN_存储技术.ppt

Page # EMC Core Presentation EMC Confidential Closing Slide 信息基础设施需求剧增 传统与知识经济 寻找答案 Closing Slide 计算机I/O技术的基本架构 I/O Subsystem Futures 现有的PCI总线将被什么样的总线技术取代呢？ InfiniBand Architecture (IBA)？ PCI Express（即先前的3GIO）？ PCI-X？ Closing Slide SCSI 技术 SCSI的历史 1986 SCSI-1 becomes an ANSI Standard (X3.131-1986) 8 bit, 50 pin Low Density, SE or HVD, 5 MHz bus NSE: Narrow Single Ended 1994 SCSI-2 becomes official (X3.131-1994) 8 or 16 bit, 50 or 68 pin, SE or HVD, 10 MHz bus Fast SCSI Fast Wide SCSI WSE: Wide Single Ended FND: Fast Narrow Differential FWD: Fast Wide Differential SCSI-3 1995 Ultra SCSI (Fast-20) UWSE: Ultra Wide Single Ended 1996 LVD 1998 Ultra2 (Fast-40) Ultra2 Wide 1999 Ultra3 SCSI 术语 SCSI: Small Computer Systems Interface SE: Single Ended One wire for signal which is active low (-Signal) HVD:High Voltage Differential (Originally called Differential) Two wires for one signal, + 5 VDC True if +Signal(Active high) -Signal(Active Low) LVD: Low Voltage Differential Two wires for one signal , + 1.1 VDC Host Bus Adapter: Card which connects computer to bus Narrow: 8 bit, 50 or 68 pin Wide: 16 bit, 68 pin Connector Types: 50 pin low density (Bail Lock or Thumb Screw) 50 pin high density (Thumb Screw) 68 pin high density (Thumb Screw) 68 pin VHDCI (Thumb Screw) Fibre Channel 技术 Fabric Benefits Fibre Channel Characteristics High speed serial data transfer 400MB/sec (2Gbps) full duplex connection Faster speeds are on the horizon Simultaneously supports multiple protocols Flexible and scalable topologies Standards-based architecture Potential connectivity of millions of devices Increases distance between devices Fiber Optic Multimode Fiber, 62.5 Micron – 300m @ 1Gbps / 150m @ 2Gbps Multimode Fiber, 50 Micron – 500m @ 1Gbps / 300m @ 2Gbps Single-mode Fiber, 9 Micron – 10Km+ Copper – 30m Functions and Stack Relationships FC0 - Physical Connectors Gigabit Interface Connectors (GBICs) Hub / Switch Lucent Connectors (LCs) 1/2 size of GBIC Gigabaud Link Modules (GLMs)