Date: Tue, 22 Feb 2000 11:35:46 -0700 (MST) From: "Justin T. Gibbs" <gibbs@narnia.plutotech.com> To: Mike Smith <msmith@FreeBSD.ORG> Cc: scsi@FreeBSD.ORG Subject: Re: Help to write a SCSI block driver Message-ID: <200002221835.LAA66028@narnia.plutotech.com> In-Reply-To: <200002220739.XAA08488@mass.cdrom.com>
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> This is not actually correct; all of these adapters have SCSI passthrough > interfaces (except perhaps the Compaq controller, which I haven't looked > at that closely). > > However, excluding the DPT (which I am not familiar with), none of these > controllers present an interface which looks anything at all like a SCSI > disk between a managed array and the system, and thus it's not appropriate > to use CAM and the 'da' driver to talk to them. > > The Mylex driver, at least, will be growing a CAM passthrough for > non-disk devices at some point in time. This always seemed to be the correct approach to me. I don't know why the orginal DPT driver was not first written as a block driver with an extra translation layer for "other" SCSI devices on the bus, but I don't know much about the DPT architecture. -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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