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.
But as far as I know any particular piece of data (disc address) would still
only be accessed through one path and never the other path. For any one disc
IO MPE can not do an "either/or" scenario between two controller cards. It
would still only service the request through the controller for the LUN
where the data resided.
-----Original Message-----
From: Craig Lalley [mailto:[log in to unmask]]
Sent: Monday, March 24, 2003 3:52 PM
To: [log in to unmask]
Subject: Re: Model 20 Disk array
Gilles,
Thanks for the info. But now I am getting conflicting information. Would
anyone else care to comment?
Gilles Schipper <[log in to unmask]> wrote:
>Yes, mod20's can be INSTEAD OF software disk mirroring on the HP3000.
>
>Better still, you can use mod20's to mirror the MPEXL_SYSTEM_VOLUME_SET -
>something which cannot be accomplished with MIRROR/iX software.
Great, that is what I would want to do.
>Also, the mod20 permits dual-controller access to the HP3000 - a feature
>NOT available with the far more expensive Autoraid 12H.
Is this true? I have heard about 3 yes and 3 no's.
>Each mod20 supports a maximum of 8 luns - the same limit as the
Autoraid12H.
8 luns, but 20 mirorred disks, hmmm doesn't compute. So are you saying I
can only have a maximum of 8 disks mirrored on two channels?
>In a nutshell, I highly recommend the nike mod20 disk array.
>
>I suggest dual Storage Processors (SP's) and maximum memory (which,
>officially is 64mb per SP, but 128mb per SP works just fine.
Has anyone else done this? This could be the reason why Larry couldn't get
it to work.
Thanks in advance.
-Craig
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