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

Mon Aug 13 11:28:17 CDT 2007

On Sat, 2007-08-11 at 10:42 +0200, S. J. van Harmelen wrote:

> 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:

What are the errors it gives you? # chkconfig --add --level 2345
SMagent? (red-hat-command) to add as a service daemon 
# service SMagent start | stop | restart

> 
> 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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> > > 
> > > _______________________________________________
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> > -- 
> > ~/john
> > 
> > OpenPGP Sig:BA91F079
> 

-- 
~/john

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