Serial Attached SCSI (SAS): Building Up, Moving Out

The new SAS-3 release, scheduled for 2012, can be expected to provide further management enhancements. Like its predecessors, SAS-3 will do more than double the available bandwidth.

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"SCSI devices — first parallel and now, SAS — provide the lion’s share of enterprise storage devices, and it seems likely that this leadership role will continue well into the foreseeable future. This is because as demands for better performance, configuration flexibility and manageability have increased over time, the SAS standard and the products that support it have also evolved. Second-generation SAS products are well established in the marketplace today, and progress continues with the design of a third-generation product set, which will begin to roll out in 2012. "Because first-generation SAS operated at 3 Gb per second, second-generation operates at 6 Gb per second, and the next generation will operate at 12 Gb per second, most end users continue to think of each generation in terms of its bus speed. Bus bandwidth provides a handy and descriptive shorthand, but there is much more going on than faster I/O."

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