What's the deal with SAS? (its adoption seems to be overwhelmed by Fibre Channel and SATA disks)

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What's the deal with SAS? (its adoption seems to be overwhelmed by Fibre Channel and SATA disks)

The price of a SAS disk drive now (whether 2.5-inch or 3.5-inch form factor) is higher than it will be in six, 12 or 18 months. If you need them today, go ahead and buy them. You will realize the SAS benefits -- there is certainly a place for SAS. But, the market is generally broken into two divisions or major price bands; the high end and the low end. In between is the overlap of the midmarket.

@36263 At the high end, we'll continue to see Fibre Channel drives for high performance. We'll also continue to see some SATA drives for high capacity in the higher end applications. At the low end, we use SATA for low cost and high capacity, but there may also be Fibre Channel drives for some applications -- these are being replaced by SAS drives for their performance and reliability, but SAS shares the same interface as SATA and this eliminates the expense and complexity of Fibre Channel drives at the low end.

For the moment, SAS probably won't make too much of a dent into existing Fibre Channel drives at the high end, but expect to see Fibre Channel deployments be displaced by SAS in the mid- and entry-market price bands. This should happen up into the midmarket where the mix of performance and economy are best suited to SAS. For example, SAS drives may displace SATA drives in midrange network-attached storage (NAS) and iSCSI arrays. Effectively, SAS should appear in the middle of the market, moving up a little bit into the high end to displace Fibre Channel and down into the low end where it coexists well with SATA.

I expect to see a lot more of SAS technology in the near future. It's showing up more and more in blade servers and traditional servers. SAS is also appearing more in iSCSI storage. The real growth area is in 2.5-inch SAS drives for their high-density and lower power consumption, and the SAS controller's compatibility with SATA drives where both drive types can operate together on the same controller.

Go back to the beginning of the Disk Hardware FAQ Guide.


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