![]() ![]() The SAS system is usually implemented by businesses that have substantial storage, backup, and archiving needs. Expanders: Optional port-multiplier hardware that enables you to extend the number of storage devices you can connect to a SAS system.Service Delivery Subsystem: The system that connects the SAS initiators with the targets.Initiators: The mechanism for receiving and responding to requests from the targets.Targets: The storage devices that are connected to a SAS system.The term serial denotes that the data is transferred one bit at a time, sequentially. It means that data is transferred directly from the storage space to the computer it is storing the data for and the other way around, directly through a physical cable that connects them. SAS is a protocol for point-to-point data transfer between computers and storage devices. In the case of business enterprises, SAS is crucial when it comes to accessing mass storage devices. It is a method of transferring data between computer peripheral devices one bit at a time through a thin cable. SAS stands for Serial-Attached SCSI (Small Computer System interface). In this post, we will discuss how these technologies work, how one is different from the other, and what are the advantages and disadvantages of each technology. Unless Fibre Channel comes out with a low-cost alternative to its present set of drives, it is likely to lose out as a drive connection in the long run.SAS and SATA are technologies used by computers to transfer data from the motherboard to storage and the other way around. For disk drives on the SAN, SAS will likely win, but the SAN connection will continue to be Fibre where it is presently Fibre. For connectivity to SANs, Fibre Channel will continue to lead, but iSCSI will pick up momentum.ĥ. For near-line storage, “best in class” will lose out to “good enough.” SATA wins.Ĥ. For servers, both direct-attach and inside-the-box drives will be SAS.ģ. If you buy a SAS box to put them in, you can play mix-and-match with SAS and SATA drives to your heart’s content.įor the long run, as I gaze into my crystal fishbowl, here is what I see:Ģ. The appeal of this will increase if the idea of tiered storage has value for you (if you are considering the benefits of information lifecycle management, this should be the case).Īs for SAS and SATA, when choosing between them follow this rule:Ĭhoose SATA when cost is the most important issue choose SAS whenever data availability and performance count. If you are looking for more flexibility however, then the SAS-SATA interchangeability is likely to be more appealing. If you are a happy Fibre Channel user, and don’t mind paying the slight price differential, you are likely to continue using it. The choice between Fibre Channel and SAS is at present a tough one, as performance is going to be pretty much the same on both platforms for the near future. ![]() * SAS drives are faster, and offer several features not available on SATA, including variable sector sizes, LED indicators, dual ports and data integrity. * SAS drives are tested against much more rigid specifications than are SATA drives, and have a significantly longer mean time between failures and duty cycle. * While both types of drives plug into the SAS backplane, a SATA backplane cannot accommodate SAS drives. * SAS drives have dual porting capability, faster spindle speeds and lower latencies. Major differences between the two technologies are: * Both are long-proven technologies, with worldwide acceptance. * The drives are interchangeable within a SAS drive bay module.
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