Johns Daniel wrote:
>
> [Sorry, this is not directly ON-TOPIC!]
>
> For a new proposal we are writing [has to do with disk
> farms], we need to connect two Linux PCs back-to-back
> through a SCSI interface! [Actually, one machine is
> legacy big iron and the other is a Linux PC.]
>
> Essentially, this means there will be two SCSI
> controllers on a SCSI daisy chain. Is this allowed?
> I would assume that the SCSI protocol only allows for
> a single controller on a channel?
>
> If dual controllers are not allowed, is a workaround
> possible? For example, by modifying the Linux SCSI
> driver?
Johns,
There is nothing in any SCSI specification which would
prevent you from doing what you want. In fact I have
an old Motorolla VME based "system" that does just what
you are talking about (except that it actually has 3
controllers from 3 seperate computers on each disk).
That said, I have tried this using RedHat 4.2 and
the adaptec 2940U host adapter. It was *not* a pretty
sight to see. Not knowing much about SCSI internals,
I would say that the aic7xxx drivers don't support
mutiple controllers on the same bus! I got all kinds
of error reports of timeouts and bus resets from the
drivers.
If by chance you do get anything to work in this area
I'd be really interested in hearing from you.
George Lass
--
... Unix IS a user friendly O/S ...
(It's just picky about its friends)
-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to [EMAIL PROTECTED]
