Date: Wed, 17 Apr 1996 22:25:52 +0200 From: se@zpr.uni-koeln.de (Stefan Esser) To: "Craig Shaver" <craig@seabass.progroup.com> Cc: freebsd-scsi@freebsd.org Subject: Re: Changing ID of 2940UW + ncr too ??? Message-ID: <199604172025.AA03007@Sisyphos> In-Reply-To: "Craig Shaver" <craig@seabass.progroup.com> "Re: Changing ID of 2940UW %2B ncr too ???" (Apr 16, 13:03)
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On Apr 16, 13:03, "Craig Shaver" wrote: } Subject: Re: Changing ID of 2940UW + ncr too ??? } I tried to use both the narrow and wide channels of a tyan ncr825 controller, } and had problems when I set the wide drives to id's higher than 7. I got } errors on the wide drive and some of the errors had a 7 in the message. I } was not able to save any of the error messages because the system would } just freeze up and I forgot to write them down. I have a hunch it may be } related to this. This is supposed to work, but I'm afraid has never been actually tested before ... } How does the ncr controller handle high id's and mixing id's on a wide } controller with dual channels? It recognizes 825's and 875's ok. I have } one of each. I can help with testing if needed. The priority is thus, that 8 is lowest, 7 highest: low 8..15, 0..7 high This is because a narrow drive will only see drives in the 0..7 range competing for bus arbitration, while wide drives will see all of 0..15 and can react accordingly (i.e. give up the bus to a narrow device, that doesn't have a chance of seeing the device with ID higher than 7). This ought to work just fine, as long as you leave the controller at SCSI ID 7 ... Regards, STefan -- Stefan Esser, Zentrum fuer Paralleles Rechnen Tel: +49 221 4706021 Universitaet zu Koeln, Weyertal 80, 50931 Koeln FAX: +49 221 4705160 ============================================================================== http://www.zpr.uni-koeln.de/~se <se@ZPR.Uni-Koeln.DE>
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