Date: Sat, 12 Jul 1997 14:26:25 -0700 (PDT) From: asami@cs.berkeley.edu (Satoshi Asami) To: crb@Glue.umd.edu Cc: gary@tbe.net, freebsd-scsi@freebsd.org, freebsd-isp@freebsd.org, freebsd-hardware@freebsd.org Subject: Re: NCR SCSI controllers Message-ID: <199707122126.OAA09547@silvia.HIP.Berkeley.EDU> In-Reply-To: <Pine.SOL.3.95q.970712164235.2380A-100000@periodic.eng.umd.edu> (crb@Glue.umd.edu)
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* From: crb@Glue.umd.edu Gee, I know someone with a very similar mail address! ;) * > Sorry about the cross-post, but I thought the question is appropriate to * > both lists... Unless you are asking something about performance under a huge number of disks and heavy load or something, I don't see the relevance with -isp. And for -hardware...we have -scsi just for these kind of discussions (;), the next person to follow please chop -isp and -hardware out of the CC: list. * > We were looking at the NCR 53C810 and -815 PCI SCSI controllers and were * > just wondering if anybody has experience/problems with them. Also if * > anyone has happened to compare them to Adaptec controllers, I would be * > glad to hear how they turned out. TIA! I've had 810- and 825-based controllers, they have worked very well over the years. However, the Adaptec is very stable now too. The main difference is probably the price ($70 for 810, $120 for 875, $200+ for 2940*) and configurability. I'm not sure if the current NCR's BIOSes let you change the Adapter's ID's, sync/wide negotiations per device, etc. -- mine doesn't, in fact mine doesn't even have a boot setup menu. Also, I don't know how the NCR controllers perform under heavy load as I never had more than two disks on them -- the Adaptec generally works fine with 14 disks in 10MHz mode or 8 disks in 20MHz mode (cable length problem). * I do have to admit, however, that I am not getting ultra-wide speeds out * of my Tekram even though I have an ultra-wide capable IBM UltraStar 2es * but I haven't really looked into it yet to see if this is just a configuration * problem or what. Our NCR driver doesn't support it yet. Stefan Esser (se) is working on it. Based on past experience, my guess is that it will start working soon because se is working on it. :) Satoshi
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