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SAS (Serial Attached SCSI) is the next step up from SATA desktop storage. SAS can also accommodate both low-cost, high-capacity SATA disk drives as well as long-life, high-performance SAS drives. This ability to support two classes of drives offers users and systems/storage integrators new levels of flexibility in designing, scaling, and managing disk arrays.
In fact, the key advantage of SAS is choice. Moving to SAS lets users meet Performance, Capacity, and Reliability Requirements, while being able to employ legacy SCSI software and mix-and-match SAS and/or SATA drives.
SAS drives are better suited for random, small-block transactions while SATA drives are the best choice for sequential, large-block I/O. SAS drives are quickly gaining market share with Parallel SCSI drives because of the systems flexibility.
SAS Controllers can attach huge arrays of drives using expanders. SATA drives may be used in SAS networks for large inexpensive storage or backup for the best GB per dollar. For the best in data security use the highly rated SAS drives.
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