[3926] in linux-scsi channel archive
RE: questions about external SCSI
daemon@ATHENA.MIT.EDU (Santosh. A)
Fri May 15 00:21:49 1998
Date: Fri, 15 May 1998 09:04:56 +0530 (IST)
From: "Santosh. A" <santoshr@tagore.wipinfo.soft.net>
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>
In-Reply-To: <D31DCE9F9C27D111AD2A0000F820847B7F481B@zeus.sunybroome.edu>
yes, this concept is called shared scsi, wherin you can have multiple
initiators sitting on the same scsi bus. however, it would require
software support from the target drivers the o.s. provides in terms of
RESERVE, RELEASE scsi cmds. further, i am not aware of any
restrictions that the initiators need to have the highest scsi ids.
however, uniqueness of scsi ids among the scsi devices on the same
scsi bus is essential.
tx,
santosh
On Thu, 14 May 1998, 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
#####################################################################
Santosh A Rao mail:santoshr@wipinfo.soft.net
Senior Software Engineer, phone:
NCR Dedicated Facility, office:91-80-2241730. extn. 3309.
WIPRO Technology Solutions. res:91-80-3345713
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