[3928] in linux-scsi channel archive
RE: questions about external SCSI
daemon@ATHENA.MIT.EDU (Eva Hocks)
Fri May 15 13:51:05 1998
Date: Fri, 15 May 1998 15:56:49 +0200 (CED)
From: Eva Hocks <hocks@clri6a.gsi.de>
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>
On Thu, 14 May 1998, CAMPBELL, BARRIE B wrote:
Haven't done it with linux but on two AIX workstations. The SCSI setup is
called "daisy-chain". The devices should be verified if they are able to
support a two host connection. As well the SCSI terminater has to be
external, not on the SCSI adapter which would be provided by Y-cables.
For concurrent use of filesystems on a disk make sure the filesystem
itself does support that otherwise you'll destroy your data.
Eva.
> 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
>
> > ----------
> > From: Ulisses Alonso
> > Reply To: ulisses@pusa.eleinf.uv.es
> > Sent: Sunday, May 10, 1998 12:53 PM
> > To: linux-admin@vger.rutgers.edu; linux-scsi@vger.rutgers.edu
> > Subject: questions about external SCSI
> >
> > Hello all,
> >
> > Hello I'm quite new to SCSI, and I have yet some doubts (I have
> > resolved
> > others by looking the excelent SCSI howto and SCSI faq)...
> >
> > The setup: two onboard aic7880 (adaptec 2940UW), one(adapter 0) being
> > used with 2 internal HDs and 1 internal CDROM, the other(adapter 1)
> > has
> > no devices attached (yet)...
> >
> > Hopefully the other controller will have an external DAT drive and an
> > external CD-ReWriter, this devices will be shared with a NT UnServer
> > 4.0
> > computer...
> >
> > and the questions are...
> >
> > 1) Can I add on the fly (while system is running) devices to "adapter
> > 1"
> > if this adapter has no other devices?
> >
> > 2) Is this possible with other devices attached but no running?
> >
> > (I think these things can be done with DPT's adapters, from the
> > "storage
> > manager" utility with the quiet "SCSI bus" option)
> >
> > 3) How I can tell Linux to scan the "adapter 1"'s SCSI bus to search
> > devices?
> >
> >
> >
> > Any comment/suggestion will be greatly appreciated
> >
> > Thanks in advance
> >
> >
> > Ulisses
> >
> > PD: please if you read this from linux-scsi@ CC: your reply to me
> > directly
> > since I'm not subscribed to that mailing-list...
> > ----------------------------------------------------------------------
> > -------
> > "Computers are useless. They can only give answers." Pablo
> > Picasso
> >
> >
> >
>
----------------------------------------------------------------------
Eva Hocks phone: (49) 6159 71-2701
GSI, Darmstadt FAX: (49) 6159 71-2986
Internet: E.Hocks@gsi.de
http://www.gsi.de/~hocks/
----------------------------------------------------------------------
"All our dreams can come true -- if we have the courage to pursue them"
(Walt Disney)
-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@vger.rutgers.edu
