Date: Thu, 22 Aug 1996 17:02:38 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com> To: tege@matematik.su.se (Torbjorn Granlund) Cc: scsi@freebsd.org Subject: Re: Adaptec 2940UW sync at low rates Message-ID: <199608230002.RAA13172@GndRsh.aac.dev.com> In-Reply-To: <199608222237.AAA15687@insanus.matematik.su.se> from Torbjorn Granlund at "Aug 23, 96 00:37:06 am"
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> When the 2940UW is set in "Ultra mode", it refuses to talk at lower than 10 > MB/s to any devices. Unfortunately, I have a Toshiba 6.7x CD-ROM drive, and > a HP DAT drive that max out at 4.4 MB/s and 5.0 MB/s respectively. FreeBSD > warns about these devices, but to my surprise, at least the CD-ROM seems to > work great! (I haven't tried the DAT drive yet.) > > My first stupid question is: Can I ignore this problem, or will it cause > serious problems with the devices that I simply haven't run into yet? This one I will have to defer to Justin on, I've seen it before and I think it was just a bug in the code that he fixed, you may have an old version of the code (you failed to even mention what version of FreeBSD you are running :-(). > My second stupid question is: Can an ASUS SC200 coexist with an 2940UW? Yes. > Which one's boot ROM will win...? :-) (The boot ROM for the SC200 is on the > ASUS motherboard.) The one in the higher numbered PCI slot on ASUS boards will be the boot device. > My third stupid question is: If one uses several similar SCSI controllers > (say an 2940UW and a plain 2940), which one will be ahc0 and which one will > be ahc1? Same story, the one in the higher numbered PCI slot will be the boot device. > My last stupid question is: Are there (FreeBSD-supported) Ultra SCSI > controllers that support more speeds than the 2940UW? I'll run out of PCI > slots if I am forced into using two SCSI controllers. The 2940UW should be able to handle all devices at all speeds at the same time, if I am wrong on this I am sure Justin will let me know. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Reliable computers for FreeBSD
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