TAILIEUCHUNG - Networking: A Beginner’s Guide Fifth Edition- P41

Networking: A Beginner’s Guide Fifth Edition- P41:I have run into many people over the years who have gained good even impressive working knowledge of PCs, operating systems, applications, and common problems and solutions. Many of these people are wizards with desktop computers. | 182 Networking A Beginner s Guide Ultra SCSI Also called SCSI-3 this specification increases the SCSI bus speed even higher to 20 MHz. Using a narrow 8-bit bus Ultra SCSI can handle 20 MBps. It can also run with a 16-bit bus increasing the speed further to 40 MBps. Ultra2 SCSI Yet another enhancement of the SCSI standard Ultra2 SCSI doubles yet again the performance of Ultra SCSI. Ultra2 SCSI subsystems can scale up to 80 MBps using a 16-bit bus. Ultra160 SCSI By now you should know the story Ultra160 SCSI again doubles the performance available from Ultra2 SCSI. Ultra160 SCSI previously called Ultra3 SCSI is named for its throughput of 160 MBps. Ultra320 SCSI Ultra320 SCSI can move data at a rate of 320 MBps. Ultra640 SCSI Another doubling of the SCSI interface speed Ultra640 SCSI was promulgated as a new standard in early 2003. NOTE A storage connection technology called Fibre Channel can use either fiber-optic or copper cable is a much more flexible connection scheme than SCSI and promises throughput many times faster than even that of Ultra640 SCSI. Based loosely on a network paradigm Fibre Channel is initially expensive to implement but large data centers will benefit greatly from its advances over SCSI. As you can see from the preceding list a dizzying array of SCSI choices is available on the market today. Because of all the different standards it s a good idea to make sure you purchase matched components when building a SCSI disk subsystem or when purchasing one as part of a server. Make sure the controller card you plan to use is compatible with the drives you will use that the card uses the appropriate cables and that it is compatible with both the server computer and the NOS you will use. The good news is that once you get a SCSI disk subsystem up and running it will run reliably and with excellent performance. Disk Topologies It s a RAID The acronym RAID stands for redundant array of independent disks. RAID is a technique of using many disks to do the .

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