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Date:      Thu, 2 Mar 2000 18:52:02 +0100
From:      Brad Knowles <blk@skynet.be>
To:        Clifton Royston <cliftonr@lava.net>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: Crash on boot when disks are present?
Message-ID:  <v0422081cb4e459abf349@[195.238.1.121]>
In-Reply-To: <20000302073558.A3582@lava.net>
References:  <v0422080bb4e401fc570d@[195.238.1.121]> <20000302073558.A3582@lava.net>

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At 7:35 AM -1000 2000/3/2, Clifton Royston wrote:

>  Have you tried installing a fresh master boot record on the new virtual
>  drives?

	They never had one to begin with (no OS is stored out there), so 
I don't understand how this could make a difference.

>  It's possible that changing the RAID sets around has caused either the
>  BIOS or FreeBSD to try to boot off of those drives when they're
>  present.

	That happens all the time.  Any time I boot the machine while the 
drive array is turned off, or if I delete the logical units that are 
exported to the host, then the next time the machine boots it will 
try to boot from the external drives.

	I fix this by going into the BIOS each time something like this 
happens and re-ordering the disks that will be booted from.  If I 
don't, then I get an error message to the effect of "No bootable 
image could be found.  Insert a bootable disk and press any key."

>            I did have a hard time (for instance) getting FreeBSD to boot
>  off the internal drive on the second channel of the integrated 7896;
>  the BIOS would boot the loader off the internal drive, and then FreeBSD
>  would start trying to complete the boot from the first drive it saw,
>  which was one of the external ones.

	Up until now, I either haven't gotten the loader at all (when I 
haven't re-ordered the drives that it will try to boot from), or it 
has found the loader on the internal drive and worked fine.

>  Also, of course, all the usual rules about looking for new SCSI bus
>  termination problems before all else apply; possibly the firmware
>  upgrade changed some controller settings relating to termination.

	Terminators are installed externally, and haven't been moved. 
Termination status on the host controllers hasn't changed.


	I should also note that this problem appears to be sporadic -- 
sometimes I can boot up just fine.  The problem happens much more 
frequently when I do a soft reboot, and happens less frequently when 
I hit the hardware reset switch after doing a proper "shutdown -h".

-- 
  These are my opinions and should not be taken as official Skynet policy
=========================================================================
Brad Knowles, <blk@skynet.be>       Sys. Arch., Mail/News/FTP/Proxy Admin

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