Date: Sun, 28 Jan 1996 11:50:52 -0800 From: "Justin T. Gibbs" <gibbs@freefall.freebsd.org> To: Sociedade Brasileira de Quimica/Admin <sbqadm@sbq.org.br> Cc: hackers@freebsd.org, questions@freebsd.org Subject: Re: SCSI Question Message-ID: <199601281950.LAA27544@freefall.freebsd.org> In-Reply-To: Your message of "Sun, 28 Jan 1996 17:27:15 GMT." <199601281727.RAA18205@www.sbq.org.br>
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>Hello > We have 4 servers and I'm having a little problem installing >2.1.0 in some of them: > >server 2) P100 wiht on board NCR SCSI adaptor, installed without problems >but after reboot the message "Missing Operating System". Back to the >boot.flp and forcing (W)rite in fdisk made it work This is a geometry problem, but I can't tell you the proper geometry for these controllers. Perhaps Stephan knows. You can always create a partition using DOS fdisk, and the FreeBSD installer will use those values when creating partitions during install (you can even delete the DOS partition during the FreeBSD install -- its only needed to grab the geometry from). >server 3) P90 IBM with Adaptec 2942/W and IBM 1G HD, after some fight >against the geometry installed fine but, again "Missing Operating System" >and I have found no way to make it boot from the HD. I need to use >the floppy and boot sd(0,a)/kernel instead Again, a geometry problem. The proper geometry to use is the controller's translated geometry. For the 27/28/'294x cards, this is: Extended translation enabled in SCSI-Select: If the disk is > 1gig, 255 Heads/63 Sectors per track/#MB reported by disk probe/7 cylinders example. A 2100MB disk would take 25/64/300 in the G)eometry box If the disk is <= 1gig, same as with Extended translation disabled Extended translation disabled: 64 heads/32 sectors per track/#MB reported by disk probe cylinders example. A 500MB disk would take 64/32/500 in the G)eometry box. A 1200MB disk would take 64/32/1200 in the G)eometry box. You will have to re-install to correct the problem. >server 4) The worst case :-(, this is an old DEC 486Dx/33 server with an >Adaptec 1742 controller and two (450M sd0, 1.1G sd1) hard disks. >This computer is running FreeBSD since 1.0 and I never had problems >installing FreeBSD on it, yesterday I upgraded it from 2.0-pre-2.0.5-snap >to 2.1.0 and I got the evil "Missing Operating System" again! >I've tried all ways to make it bootable but as server (3) I need to >boot using the floppy. Same as for the 27/28/294X except some versions of the 1742 don't have an extended translation mode. >We can't stop the server (4) and it is running this way, I would >like very much to correct the problem without reinstalling it. You'll have to in order to correct the problem. >Romeu -- Justin T. Gibbs =========================================== FreeBSD: Turning PCs into workstations ===========================================
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