From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luben Tuikov Subject: Re: "do ata" scsi command? Date: Sat, 17 May 2003 03:49:24 -0400 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <3EC5E984.90408@rogers.com> References: <20030515230223.GA516@gtf.org> <20030516060324.GT812@suse.de> <3EC509A1.10503@pobox.com> <20030516160502.GE812@suse.de> <3EC51235.8090701@pobox.com> <20030516163558.GH812@suse.de> <3EC514AD.4000504@pobox.com> <20030516164320.GK812@suse.de> <3EC5B7DE.4060402@torque.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from fep01-mail.bloor.is.net.cable.rogers.com ([66.185.86.71]:14422 "EHLO fep01-mail.bloor.is.net.cable.rogers.com") by vger.kernel.org with ESMTP id S261287AbTEQHgg (ORCPT ); Sat, 17 May 2003 03:36:36 -0400 In-Reply-To: <3EC5B7DE.4060402@torque.net> List-Id: linux-scsi@vger.kernel.org To: dougg@torque.net Cc: Jens Axboe , Jeff Garzik , linux-scsi@vger.kernel.org > In SAS we have a pure SCSI command set protocol (SSP), Those are not command set protocols, they are _transport_ protocols (specific to the SAS interconnect). (Command Set Protocols are things like SBC, RBC, MMC, etc, i.e. ``above'' SAM-3/SPC-3.) > a management protocol (SMP) and a protocol for tunnelling > the ATA/PI command set/task file over an SAS link (STP)**. > The idea is that users will be able to plug either SAS > or SATA disks into their RAID backplanes. > > So we are likely to get a SAS HBA in the SCSI subsystem > (from Justin??) that is an initiator for those three > protocols. How do we handle STP?? STP talks to the ATA application layer (IDE layer). Its only (business-political) purpose is to allow SATA over the SAS interconnect. Overall, that'd be one complicated LLDD if it supported all three... -- Luben