[Fwd: Re: RDAC Multi-Path Proxy Driver]

[S. J. van Harmelen]

Oke, got a bit further...

I now understand how to use the disks. Only thing thats not going oke is
that I get these errors constantly (while formatting):

end_request: I/O error, dev sdf, sector 30408704
end_request: I/O error, dev sdf, sector 30670848
end_request: I/O error, dev sdf, sector 30932992
end_request: I/O error, dev sdf, sector 31195136
end_request: I/O error, dev sdf, sector 31457280

or (while editting a file):

end_request: I/O error, dev sdc, sector 966656
device-mapper: multipath: Failing path 8:32.
end_request: I/O error, dev sdc, sector 966720
device-mapper: multipath: Failing path 8:32.
end_request: I/O error, dev sdc, sector 96665

And the device seems very slow...

Any tips, pointers?

Sander


-------- Forwarded Message --------
From: S. J. van Harmelen <svh at dds.nl>
To: linux-poweredge <linux-poweredge at dell.com>
Subject: Re: RDAC Multi-Path Proxy Driver
Date: Fri, 10 Aug 2007 15:26:26 +0200

Thanks for your reply Jeff!

Do you have a good site or something where I can get more info on this?
As for now I seem to be stuck.

I'm trying to use the opensource Multipath I/O driver with
device-mapper, but I can't seem to figure out how to configure this all.

I have one host with two HBA ports connected to two different RDAC's on
the same MD3000. When I run multipath -l I see all the path's and all
drives but then what? How do I get to use these drives.

Besides that I keep getting a segmentation error when I do: dmsetup
create -U xxxxxxxxxxxx

And I see these all the time: end_request: I/O error, dev sdc, sector 0

Hope you can give me another hand...

Regards,

Sander


On Thu, 2007-08-09 at 15:51 -0500, Jeff Macfarland wrote:
> I've really only experienced RDAC on IBM san equipment. Yes, basically
> it manages multipath devices, failover, hot adding devices and the like.
>  You will probably be able to achieve most of what you want with the
> device-multipath driver.
> 
> Times when I ran into trouble was with IBM DS4x00 equipment and its
> concept of "preferred controller" along with concurrent access to shared
> storage from multiple hosts over multiple paths. RDAC handles sorting
> all that out and also the ADT aspect of failover.
> 
> I also have no knowledge of the MD3000 or how it functions, so you're
> kind of on your own to figure out if you *need* RDAC.
> 
> S. J. van Harmelen wrote:
> > Hi guys,
> > 
> > I'm trying to install this driver, but without any luck. 
> > 
> > So my question: What exactly does this driver do? Does it only
> > manage/create multipath redundancy of does it do more then that? If not,
> > can I replace it with something like Linux multipath IO (MPIO) using
> > multipath-tools for the same functionality?
> > 
> > I'm trying to get my NX1950 (PE1950 with SAS 5/E HBA connected to a
> > MD3000) up and running with Debian 4.0 64bit. But I can't get the RDAC
> > (MPP) driver installed. This driver needs to be compiled but is prepared
> > for Red Hat of Suse only. Can I get this to work on Debian?
> > 
> > Really hope someone can shed some light over here, cause I seem to be
> > drowning.
> > 
> > Thanks,
> > 
> > Sander
> 
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