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

Sat Aug 11 03:43:33 CDT 2007

Sorry, forgot to post to the list...

Thanks again for your response...

I seem to have this working without the I/O errors and as fast as it
should be.

But the one thing stil not working is that I can not start SMagent so I
can manage the storage unit because:

The default logical unit number (LUN) assigned to the access virtual
disk (typically 7 or 31) is not in the range supported by the host or is
already in use by the host for another device.

Any idea how to exlcude LUN31 from the device mapper or the
device-mapper-multipath driver? I think it's the device mapper because
when I unload the dm-multipath module I still get the same error. Before
installing de dm package and the multipath-tools package it worked fine.

Sander

On Sat, 2007-08-11 at 04:32 -0400, John wrote:
> First Article may be wrong? Further research finds this
> http://www.dell.com/downloads/global/power/ps3q06-20060189-Michael.pdf
> Article on Setting up Multipath from Dell, but talks about using
> Powerpath by EMC.
> Have you checked the Debian Admin Website? I myself am a Red Hat
> person not really Debian.
> 
> 
> On Fri, 2007-08-10 at 16:48 +0200, S. J. van Harmelen wrote: 
> > 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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> > 
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> -- 
> ~/john
> 
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