On Mon, 24 Mar 2003 18:32:10 -0600 (Central Standard Time), "Atwood,
Tim (DVM)" <[log in to unmask]> wrote:

>I will jump in and say "no". At least not in the same sense as HP-UX. MPE
>does not recognize two different controllers pointing to the same set of
>LUN's. MPE does not know how to handle accessing the same data through two
>different paths.
>Prior to the release of 7.5, I had been told by several sources MPE 7.5 was
>going to be able to do this. However, so far as I have been able to tell
>this was not in 7.5 when it was released. It is possible I am missing
>something or it is still to come in 7.5 Express 1. If anyone has information
>on 7.5 and multiple controllers, I would love to hear it.
>
>I suppose one could configure one set of LUN's on one controller and another
>set of LUN's on the second controller. So if you have two interface cards
>you could configure the path of each card to each controller. Essentially
>creating two sets of drives. I have never tried this and I do not know how
>it would work with mirroring.

It would work fine.

Your Model 20 has two controllers. Each would go to a FWD SCSI card on
the 3000.

Each LUN can only be controlled by one controller. So if you made a
LUN to be LDEV 1 and another to be LDEV 2, they could be controlled by
separate controllers and thus the I/O would be handled over both FWD
SCSI cards. (The Model 20 is able to move all the LUNs to a single
controller in the even that the other controller fails, but MPE is
unable to "switch gears" like that, whereas HP-UX can).

Mix and match as needed. :)

Of course, you can always buy another dual-controller Model 20 and two
more FWD controllers, thus giving you up to 4 I/O paths. Later, rinse,
repeat. :)

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