Date: Tue, 10 Oct 2000 17:52:21 -0500 From: Mark Hounschell <dmarkh@cfl.rr.com> To: Eric.Ayers@compgen.com Cc: aic7xxx@FreeBSD.ORG Subject: Re: AHA 29160 adapter and clustering Message-ID: <39E39DA5.B98B81F1@cfl.rr.com> References: <14819.35403.149833.289712@gargle.gargle.HOWL>
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"Eric Z. Ayers" wrote: > > Hello all, > > I'm working on a clustering setup for high availability using shared > storage. The point of sending this email is to: > > 1) Discover if there is some "simple" solution to my problem using > AHA7892 cards. (see description below) > 2) If not, then why does this card have a problem? What's going on? > 3) Validate the fact that single ended devices are due to be phased > out and that LVD is the way to go for the future. > 4) Seek suggestions on other LVD SCSI hostadapters that have been shown > to work well in a clustering setup. Someone from the kimberlite mailing > list has suggested that the Tekram (ncr 5380 based cards) do not > allow termination to be disabled. > > -------------- > > The cluster will use 2 x86 boxes running Linux and shared SCSI to two > external hard disks. Here is my dilemma. My first setup was with > single ended signaling and two AHA2940 cards. It seemed to work > pretty well. > > The fellow spec'ing hardware is convinced that single ended SCSI > drives will soon be scarce as hen's teeth, so we bought two new > AHA29160 cards and 2 LVD Seagate hard drives. The firmware rev on > these cards is 2.57.2. > > Oct 10 12:16:15 dru1b kernel: (scsi0) <Adaptec AIC-7892 Ultra 160/m SCSI host ad > apter> found at PCI 2/13/0 > > My problem is that these two cards do not seem to like to be plugged > together on the same SCSI chain in a cluster. Before we even started, > we called Adapted and they saidHere's what my scsi > chain looks like: > > T > | > +-disk > | > +-disk > | > +-machine A > | > +-machine B > | > T > > Termination on the cards is turned off. REset bus on IC initialization > is also turned off. I have 2 external terminators. > > What I'm seeing is that rebooting machine A makes machine B hang, and > vice versa. If I disconnect one of the machines from the SCSI bus, > that machine will not boot, unless I put a terminated SCSI bus on it, > or set termination back to auto. > > The OS doesn't even have to be booted yet for this to happen. It's > been locked up hard in the POST procedure or while trying to load the > Linux kernel from an IDE hard disk. The terminators I'm using are > active terminators. > > I'm sending this request to some other mailing lists, but not CC'ing > between them. Any advice or suggestions would be greatly appreciated! > > Thanks, > -Eric. Have you tried setting the auto term on the cards to always be auto. I was always under the impression that auto meant just that, in that the card somehow knows if there is external termination or not and will automatically turns it's termination on if there isn't external termination found and turn it off if there is external termination found. If that doesn't work then either my impression is incorrect or your cards don't work as spec'd. Good luck.. -- Mark Hounschell dmarkh@cfl.rr.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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