[3924] in linux-scsi channel archive
Re: questions about external SCSI
daemon@ATHENA.MIT.EDU (George E. Lass)
Thu May 14 13:08:42 1998
Date: Thu, 14 May 1998 10:47:59 -0500
From: "George E. Lass" <georgel@osc.com>
To: "CAMPBELL, BARRIE B" <BCC035232@acad.sunybroome.edu>
CC: linux-admin@vger.rutgers.edu, linux-scsi@vger.rutgers.edu,
"'ulisses@pusa.eleinf.uv.es'" <ulisses@pusa.eleinf.uv.es>
CAMPBELL, BARRIE B wrote:
> Somewhere I read that you could connect two SCSI controllers from
> different machines
> to a common bus. You set the ID's of the cards to be the highest
> devices on the chain,
> and then give the devices unique ID's as well
> EG.
> NT SCSI card id 14
> Linux aic1 id 13
> CDR id 10
> DAT id 9
>
> this would allow both machines to use the two devices.
> this assumes that the two machines are close enough to cable
> termination and cabling would be important.
>
> anyone else heard anything about this
>
> anyway
> TE
> Barrie B. Campbell
> bcc035232@acad.sunybroome.edu
>
You *may* have read a posting I put out several months ago.....
I have played around a bit with trying to put 2 SCSI adapters on the
same bus using 2 linux PC's:
PC1 SCSI adapter ID 6 ----> PC2 SCSI adapter ID 7---->PC2 SCSI DISK ID 0
The adapters are adaptec 2940-U and the drive is a seagate ST52160N.
The main problem with doing this is that if both adapters try to access the
bus
at the same time, they tend to get into timeout/reset wars.
I can't fully blame the SCSI code in linux for this because if I try to
boot both
PC's at the same time, the adaptec "bios" code in the 2 adapters will try
to fight it out!
If any one has any additional info on this I'd like to see it!
George Lass
georgel@osc.com
-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@vger.rutgers.edu
