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Parallel SCSI may be nearing obsolescence due to certain fundamental limitations. But the fact remains that for nearly two decades it had dominated the hard drive market through its high-performance and high-reliability enterprise storage capabilities. Customers now demand increased bandwidth and flexibility. This need was fulfilled by Serial ATA (SATA) and Serial Attached SCSI (SAS) adoption rates. When selecting SCSI, the factors that affect the choice of users are scalability, reliability and/or performance. With SATA drives, users were offered high capacities, low cost per gigabyte, improved scalability, and some improved reliability features. These products are especially used in online and transactional applications due to their exceptional performance and reliability. This paper is written with the aim of helping customers decide between SCSI technology, Serial ATA (SATA), and Serial Attached SCSI (SAS) technology while keeping in mind the specific application they use. This paper discusses the different tiers of storage and how LSI MegaRAID SAS/SATA adapters and Seagate Barracuda ES.2 SAS drives are ideal for nearline and low-cost server environments. To help get a clearer understanding between the two, the document also compares features and benefits of the new Tier 2 SAS drives (ES.2), traditional Enterprise SATA drives, and Desktop SATA drives. This paper highlights the fact that together LSI and Seagate offer their customers an unrivaled combination of performance, reliability and affordability for nearline and low-cost server applications.
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