[SunRescue] scsi cable order

[steve price]

had to go find it again - i remember a picture i saw
once...found it again as a label on the bottom of a
external unipack cdrom and tape drive, as well as
referenced in the SPARCstorage UniPack User's Guide
part number 802-3228-11 revision A, August 1996.

don't know if it's on sun docs or not, but email me
off list with a fax number and i'll fax (unfortunately
US only pls) a couple of pages to you...

--- jeff borisch <jeff at sonicrim.com> wrote:
> This is interesting. I was not familiar with this.
> It seems that whether
> they are sun boxes or not, a similar logic might
> apply to device ordering.
> 
> My intuition would say put a scsi 1 device at the
> end as it has the least
> restrictive cable length requirements and work
> backwards from that. But,
> isn't the bus arbitrated to the least common
> denominator? If you have an
> ultra scsi3 device on a bus with a scsi 1 device,
> does that mean you can
> relax to scsi 1 cable length requirements for all
> devices?
> 
> Also it would seem counterproductive to put a wide
> device farther out the
> chain than a narrow device, since the 8 wide bits
> /should/ have been
> terminated at the narrow device. But again, if bus
> falls back to the lowest
> common denominator, I'm not sure what difference it
> makes.
> 
> Anyway I'm interested in learning more about this.
> 
> Google terms: sun scsi device order
> didn't turn up anything yet. Do you know of any
> online resources?
> 
> Thanks a bunch!
> 
> Jeffrey
> 
> 
> 
> 
> 
> steve price wrote:
> > also, if all three external boxes are true sun
> boxes,
> > there is a preferred order on the external chain
> as to
> > narrow, wide, fast etc.
> 
> -- 
> 
> 
> _______________________________________________
> Rescue maillist  -  Rescue at sunhelp.org
> http://www.sunhelp.org/mailman/listinfo/rescue


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