Date: Thu, 13 May 1999 22:05:21 -0700 (PWT) From: Matthew Jacob <mjacob@feral.com> To: "Justin T. Gibbs" <gibbs@narnia.plutotech.com> Cc: scsi@FreeBSD.ORG Subject: Re: IBM scsi drives Message-ID: <Pine.LNX.4.04.9905132202460.29768-100000@feral.com> In-Reply-To: <199905140426.WAA20888@narnia.plutotech.com>
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> > > > > > 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
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