Subject: Dual SCSI, single chain?
To: 'port-alpha' <port-alpha@netbsd.org>
From: Lindgren, Jon <jlindgren@SLK.com>
List: port-alpha
Date: 03/15/1999 12:08:48
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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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<TITLE>Dual SCSI, single chain?</TITLE>
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<P><FONT SIZE=3D2>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.</FONT></P>
<P><FONT SIZE=3D2>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.</FONT></P>
<P><FONT SIZE=3D2>I guess it's more a curiosity. Does anyone know =
if it would be possible to run the following scenario?:</FONT>
</P>
<P> <FONT SIZE=3D2>Interal =
narrow SCSI controller connected via a converter</FONT>
<BR> =
<FONT SIZE=3D2>to a wide chain.</FONT>
<BR> <FONT SIZE=3D2>A good =
PCI wide SCSI card connected to the same wide chain.</FONT>
<BR> <FONT SIZE=3D2>A wide =
SCSI drive operating off of the wide chain (and,</FONT>
<BR> =
<FONT SIZE=3D2>via the converter, the =
narrow chain as well).</FONT></P>
<P> <FONT SIZE=3D2>Default =
SCSI id of 7 for one of the adapters, and perhaps</FONT>
<BR> =
<FONT SIZE=3D2>a SCSI id of 6 for the =
secondary adapter.</FONT>
<BR> <FONT SIZE=3D2>A kernel =
which is instructed to mount the root file system</FONT>
<BR> =
<FONT SIZE=3D2>via the fast SCSI =
controller. Note that the kernel</FONT></P>
<P> =
<FONT SIZE=3D2>would be loaded by the =
slow internal SCSI controller.</FONT></P>
<BR>
<P><FONT SIZE=3D2>Sorry for the HTML - I blame my employer...</FONT>
</P>
<P><FONT SIZE=3D2> -Jon Lindgren</FONT>
<BR><FONT SIZE=3D2> jlindgren@slk.com</FONT>
</P>
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