Wednesday, September 29, 2010

Why do we need SAS?

I think that Fibre Channel is SCSI serial implementation, why should it use the SAS?

Good question. Many server vendors have never used the disk fiber channel, mainly due to the Fibre Channel components may be more expensive than parallel SCSI; the same time, SCSI can be used on the motherboard, and Fibre Channel can not. Because of costs, suppliers need to be more expensive and high-performance serial execution (based on performance considerations, and did not choose Serial ATA), then SAS or Serial Attached SCSI technology came into being. Therefore, the use of SAS reason is price, because in this way to be cheaper than Fibre Channel; but SAS's performance and transmission distance will strike some discount.

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