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SCSI(small computer system interface)
- 2. • What IsStorage Device • History Of SCSI • What is SCSI • Internal SCSI • External SCSI • SCSI Host Adapter • Types Of SCSI • SCSI ID • Daisy Chaining • Termination • Advantage Of SCSI • Disadvantage Of SCSI
- 3. Storage Devices ? •It can hold & store information both temporarily & externally & can be internal or external to a computer, server or any similar computing device.
- 4. History of SCSI SCSIis derived from “SASI” the shugart Associated system interface “, developed circa 1978 and publicly disclosed in 1981. Larry Boucher is considered to be the “father“ of SCSI and ultimately SCSI due to his pioneering work first at shugart Associates and then at Adaptec.
- 5. The SmallComputer System Interface is a set of parallel interface standards for attaching disk drives, printers, scanners and other peripherals to the computers. it’s a drive interface standards that had been around as long as the earliest ATA standards.
- 6. Internal SCSI • InternalSCSI device are installed inside the pc & connect to the host adapter through the internal connector. • Multiple internal devices can be connected together by using a cable with more connector.
- 7. External SCSI • ExternalSCSI devices are connected to the host adapter through the special SCSI external connector of the host adapter • All external connection have two connection it the back to allow for daisy chaining of multiple external devices.
- 8. SCSI Host Adapter •A SCSI host adapter is a device used to connect one or more other SCSI devices to a computer bus.it is commonly called a SCSI controller, which is not strictly correct as any component understanding the SCSI protocol can be called a controller.
- 9. Types of SCSI SCSI1 (Narrow SCSI) • It’s used 50 pin cable with maximum transfer rate 5MBps & it used 8 bit bus and support a maximum 8 device (HD)
- 10. SCSI 2 • Itused 25,50 or 68 pin cable with a transfer rate of 10MBps it originally used 8 bit bus but an enhancement fast wide SCSI that uses 16 bit bus & support 16 device with transfer rate of 20MBps.
- 11. SCSI 3 • Ituses 50,68 or 80 pin cable & the most common cable is 80 pin single connector attachment(SCA) it’s also called ultra SCSI .also used 16 devices connected. • Types speeds(MBps) speeds(Gbps) • Ultra 160 160 MBps 1.28Gbps • Ultra 320 320 MBps 2.56 Gbps • Ultra 640 640 MBps 5.12 Gbps
- 12. SCSI ID • SCSIdevice are control by SCSI controller each devices including the controller is assign SCSI ID using number from 0 to 15 the controller is normally assign the highest priority SCIS ID of 7 .it’s used a controller ID
- 13. Daisy Chaining • SCSIdesigns are connected together in a daisy chain fashion which indicate are devices are connected each other likes links in a chain state of been connected directly to a central devices. SCSI controller is an expansion card plug into the motherboard & it has an internal devices an as external devices.
- 14. Terminator • Each deviceshas two connector to support daisy chain connection . Additionally the last device the chain must be terminate to late the controller known that there are not any additional devices in the chain.
- 15. Advantage 1. Its performanceis much faster than IDE or SATA. 2. Many devices (nearly 16) can be attached at the same time on a single controller. 3. The interfacing for different types of devices is done through the same cable. 4. The peripheral devices of the same type have common characteristics so it is easy to replace the old devices. 5. The peripheral devices are independent so the computer can do other work.
- 16. Disadvantage 1. The SCSIdrives and hardware are more expensive than IDE or SATA. 2. It may be difficult to configure older models because each device needs a special ID number and correct termination.