Subject: Dual SCSI, single chain?
To: None <netbsd-users@netbsd.org>
From: Lindgren, Jon <jlindgren@SLK.com>
List: netbsd-users
Date: 03/15/1999 12:04:18
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The Alpha has a not blazingly fast internal SCSI interface which happens to
be one of few boards actually supported via the boot prom.  I was
interrested in determining if one might be able to connect the SCSI chain
together with a faster chain, allowing one to boot off the same disk but off
a different adapter.

Obviously, it would be probably be much better to 1) netboot the box, or 2)
have a boot disk and an actual disk which are seperate.

I guess it's more a curiosity.  Does anyone know if it would be possible to
run the following scenario?:

	Interal narrow SCSI controller connected via a converter
		to a wide chain.
	A good PCI wide SCSI card connected to the same wide chain.
	A wide SCSI drive operating off of the wide chain (and,
		via the converter, the narrow chain as well).
	Default SCSI id of 7 for one of the adapters, and perhaps
		a SCSI id of 6 for the secondary adapter.
	A kernel which is instructed to mount the root file system
		via the fast SCSI controller.  Note that the kernel
		would be loaded by the slow internal SCSI controller.


Sorry for the HTML - I blame my employer...

 -Jon Lindgren
 jlindgren@slk.com

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