What are the Advantages of SCSI drive?
Small Computer System Interface is a fast bus that connects multiple devices to a computer at the same time. These include hard drives scanners CD drives and printers. It is a set of standards that are used to connect and transfer data between computers and peripheral devices physically. The SCSI standards define commands, electrical and optical interfaces. The SCSI has been developed into the modern physical versions of SCSI –the Serial Attached SCSI (SAS) and others that break from the standards and perform data transfer through serial communication. The serial interfaces have higher data rates, longer reach, cable connections and improved fault isolation.
There are many advantages of using SCSI drives. Compared to IDE and other bus technologies, SCSI is able to deactivate devices while they are still working, therefore, freeing the bus for other peripheral devices. This makes it possible to have up to eight devices on a SCSI bus at the same time. When the system needs data from the device it commands the device to disconnect until the data is fetched. It then continues with the cycle on other devices. This makes SCSI more efficient than IDE when dealing with more than one device.
Over the years, SCSI has had a clear advantage over ATA and IDE technologies. SCSI is faster than using the single device IDE and ATA although it seems to be more expensive. The SAS SCSI connects via serial cable instead of the parallel connector, and they are easier and cheaper to set up.
The Serial Attached SCSI brings more flexible storage solutions to the user and system integrators. It provides an interconnect mechanism for SCSI and SATA hereby, meeting midrange and enterprise storage requirements at a low cost. It also provides a tunnelling mechanism to connect SATA frames through SAS SCSI connection infrastructure including physical cabling. This ensures plug and play between both SAS and SATA targets.
The serialization of the SCSI interface overcomes the limitations of parallel interface technology, which was mainly the bandwidth requirements, power consumption and clock skew which are all solved by the serialization. Also, port aggregation makes the SAS act independently thus if the connection is lost on a single port, only the bandwidth is compromised and not the entire session service or connection.
The SAS SCSI architecture addresses large storage capacities in the dense enclosure taking advantage of the 2.5-inch drive. It also addresses bandwidth requirements by aggregating schemes that logically bind several connections together.
The development of SAS SCSI it has increased the advantages of the Small Computer System Interface.