[opensuse] Re: SATA / SAS controllers.

Greg Freemyer skrev:

On 3/5/07, Anders Norrbring wrote:

...

Right.. I'm actually looking at this http://www.adaptec.com/en-GB/products/sas/raid/SAS-4800/

Has anybody worked with any of the mix and match SATA / SAS controllers?

They just seem weird to me, so I don't know what I think.

ie. SATA uses the ATA command set. SAS uses the SCSI command set.

Both SATA & SAS use the same cabling/voltages I believe, so there should not be an electrical issue, but I just have not seen any reports (good or bad) about controllers that can supposedly talk both ATA and SCSI.

In Linux do they use a pure SCSI driver?

BTW: 3ware uses a pure SCSI driver even for it s PATA controller line, so I don't have an issue with that, just lots of unknowns from my perspective.

Greg

As I've understood, the Adaptec SAS RAID controllers use the aacraid driver in Linux, which we all have already.. ;) They also provide some extra stuff for their HBAs. But then again, I can be terribly wrong, I haven't used SAS HBAs from Adaptec before, just SCSI. I'm not sure I understand what you mean by "mixing" SAS and SATA? On a SAS HBA, you can hook up SATA drives natively, and SAS drives as well. However, mixing both types of drives on the same channel is asking for problems.. -- Anders Norrbring Norrbring Consulting