Date: Wed, 24 May 2000 18:56:44 -0400 From: "Crist J. Clark" <cjc@cc942873-a.ewndsr1.nj.home.com> To: Brian Handy <handy@lambic.physics.montana.edu> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: SCSI Confusion Message-ID: <20000524185644.A42970@cc942873-a.ewndsr1.nj.home.com> In-Reply-To: <Pine.BSF.4.21.0005240854490.455-100000@lambic.physics.montana.edu>; from handy@lambic.physics.montana.edu on Wed, May 24, 2000 at 08:56:54AM -0600 References: <20000524002421.F40441@cc942873-a.ewndsr1.nj.home.com> <Pine.BSF.4.21.0005240854490.455-100000@lambic.physics.montana.edu>
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On Wed, May 24, 2000 at 08:56:54AM -0600, Brian Handy wrote: > >> Oh yea, dmesg might be useful. Attached at end. Anyway, here's the > >> problem: When I dismount and disconnect that last box, remove it from > >> fstab, put terminators after externalbox #1, I find that upon reboot > >> FreeBSD screams mightily, says I need to do an fsck on drives 3 and 4, > >> and dumps me in single-user mode. > > I figured it out. I just got a practical lesson in CAM: SCSI devices > aren't wired down to specific IDs, e.g. when I turned off the one set of > drives, the other two drives went from devices 3 and 4 to ... 1 and 2: > > /dev/da2s1c /c ufs rw 1 2 > /dev/da1s1c /d ufs rw 1 2 > ^^^ Always seems so obvious once you figure it out. You can wire down devices if you wish. From the LINT kernel, # The syntax for wiring down devices is: # device scbus0 at ahc0 # Single bus device # device scbus1 at ahc1 bus 0 # Single bus device # device scbus3 at ahc2 bus 0 # Twin bus device # device scbus2 at ahc2 bus 1 # Twin bus device # device da0 at scbus0 target 0 unit 0 # device da1 at scbus3 target 1 # device da2 at scbus2 target 3 # device sa1 at scbus1 target 6 > So, thanks for the help. Still unclear why partition 'c' is so bad, > please let me know. For hitorical reasons, the c-partition is assumed to contain the entire disk. The fstype should be 'unused.' Making the c-partition less than the whole disk could really mess things up. I'm really not sure how much damage making it have a fstype other than 'unused' could cause, but I'd rather not try that experiment. -- Crist J. Clark cjclark@home.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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