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

[John]

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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