Re: SATA on SAS [was: ATAPI cdrecord issue 2.5.67]

From: Justin T. Gibbs (gibbs@scsiguy.com)
Date: Sat Apr 12 2003 - 00:35:14 EST

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> Spinning this discussion another way, with Serial Attached SCSI
> (SAS) real SATA disk drives can be attached to SAS host bus adapters
> (HBAs). For that matter cdwriters that use MMC (scsi instruction
> set) over ATAPI could be SATA devices connected to a SAS HBA.

Actually, SAS does not cover the case of a SAS HBA connected directly
to a SATA device. You must through an expander since SATA devices do
not speak STP and it is the expander that provides the STP -> SATA conversion
on the backend. The spec does not preclude a SAS HBA speaking SATA
directly, but in doing so, it will be operating outside of the SAS
spec.

-- Justin

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