From owner-freebsd-scsi Thu May 13 22: 5:33 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from feral.com (feral.com [192.67.166.1]) by hub.freebsd.org (Postfix) with ESMTP id 66BA315425 for ; Thu, 13 May 1999 22:05:31 -0700 (PDT) (envelope-from mjacob@feral.com) Received: from feral.com (mjacob@feral.com [192.67.166.1]) by feral.com (8.8.7/8.8.7) with ESMTP id WAA29809; Thu, 13 May 1999 22:05:21 -0700 Date: Thu, 13 May 1999 22:05:21 -0700 (PWT) From: Matthew Jacob Reply-To: mjacob@feral.com To: "Justin T. Gibbs" Cc: scsi@FreeBSD.ORG Subject: Re: IBM scsi drives In-Reply-To: <199905140426.WAA20888@narnia.plutotech.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > > > > > > I've had some reasonable good experiences in some contexts with the IBM > > drives- but they have a wierd property of not working if your host adapter > > negotiates sync speeds before negotiating wide. Make sure these drives > > work for you before you pay! > > It doesn't make much sense to negotiate sync before wide since, > according to the spec, a wide negotiation invalidates any sync > setting. The aic7xxx driver always reverts to async after a wide > negotiation and will renegotiate sync if appropriate. So Comte Roudier informed me... I knew that sorta (I really don't need to know this for the Qlogic cards- this is done in the f/w...)... I don't really remember all the details and can dig out the fax from an IBM engineer..but the basic gist of this was I had to (for a Solaris driver) break the Solaris order of 'first sync then wide'. It's possible I could have forced renegotiation but it seems to me that there was something that would make this not work. All of this is the dance between spec && shipping h/w. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message