different between serial scsi n parallel scsi
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SCSI stands for Small Computer System Interface and is often called Parallel SCSI. The technology is over 25 years old and has a hard time keeping up with today's heavy demands for intensive hard disk reads and writes.
Its counterpart, SAS, stands for Serial Attached SCSI and was developed to address the important limitations attributed to Parallel SCSI. This brief highlights the differences between the two hard drive controller interfaces, and helps to point out the many features that explain the increasing popularity of SAS.
SCSI is simply a small set of industry standards for physically connecting computers, servers and peripheral devices together and then transferring aome data between them. Such industry standards help define overall system commands, the various protocols, the electrical and finally, they describe the optical interfaces that are in use.
Overall, SCSI is most commonly used for hard disks and tape drives, but it can also be used for a range of other peripheral devices as well, such as scanners, CDs, DVDs and of course DVD burners.
Often called parallel SCSI, this technology is based on the information bus principle. But being so old, parallel SCSI maxes out at a speed of about 320 MB/sec and its performance gets degraded even more as additional devices and various peripherals are added to the shared bus, neither of which can be compromised due to today's computational complexities in the prevailing corporate IT requirements.
For its part, SAS (Serial Attached SCSI) was developed to address the numerous I/O (input and output) and direct-attach disk storage requirements that traditional parallel SCSI technology simply couldn't meet.
On one hand, the newer technology offers logical compatibility with SCSI. It also provides the reliability, performance, scalability and manageability that IT professionals have come to expect of SCSI. Like parallel SCSI, SAS is a data-transfer technology specifically designed to move data to and from computer storage devices such as hard drives and tape drives.
Unlike SCSI, which is multi-drop, SAS is a point-to-point protocol and allows for much higher speed data transfers than has been possible with parallel SCSI.
Its counterpart, SAS, stands for Serial Attached SCSI and was developed to address the important limitations attributed to Parallel SCSI. This brief highlights the differences between the two hard drive controller interfaces, and helps to point out the many features that explain the increasing popularity of SAS.
SCSI is simply a small set of industry standards for physically connecting computers, servers and peripheral devices together and then transferring aome data between them. Such industry standards help define overall system commands, the various protocols, the electrical and finally, they describe the optical interfaces that are in use.
Overall, SCSI is most commonly used for hard disks and tape drives, but it can also be used for a range of other peripheral devices as well, such as scanners, CDs, DVDs and of course DVD burners.
Often called parallel SCSI, this technology is based on the information bus principle. But being so old, parallel SCSI maxes out at a speed of about 320 MB/sec and its performance gets degraded even more as additional devices and various peripherals are added to the shared bus, neither of which can be compromised due to today's computational complexities in the prevailing corporate IT requirements.
For its part, SAS (Serial Attached SCSI) was developed to address the numerous I/O (input and output) and direct-attach disk storage requirements that traditional parallel SCSI technology simply couldn't meet.
On one hand, the newer technology offers logical compatibility with SCSI. It also provides the reliability, performance, scalability and manageability that IT professionals have come to expect of SCSI. Like parallel SCSI, SAS is a data-transfer technology specifically designed to move data to and from computer storage devices such as hard drives and tape drives.
Unlike SCSI, which is multi-drop, SAS is a point-to-point protocol and allows for much higher speed data transfers than has been possible with parallel SCSI.
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