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Re: [dm-devel] Multipath-tools errors



Hi Chandra,

Thanks for your reply! As far as I know it does use a LSI Engenio. I
asked Dell if they can confirm this, but I didn't get any reply yet.
Will get back with the answer as soon as I get it.

Besides that it seems to be working now. I don't have any errors anymore
and it's not as slow as before. It's now doing something like 120M/sec,
but don't know if thats good or not (don't know how fast this device
should be)...

I did leave out the hardware_handler line because of the error it gives.
But I understand that is because of my kernel? I'm using the package
from Christophe's website version 0.4.8 on a Debian Etch 64bit machine
with a 2.6.22.2 kernel.

I quess I need the hardware_handler to make it work as it should? Al
true it sees all paths and says that both active. Where one is
active/ready and the other is active/ghost. 

Anything I can do about this? 

Sander






On Thu, 2007-08-16 at 10:26 -0700, Chandra Seetharaman wrote:
> First off, the "mpath_prio_rdac" is the path checker for the lsi engenio
> controller. Is the Dell MD300 based on that controller ?
> 
> If it is _not_, then you should _not_ be using mpath_prio_rdac.
> 
> If it is, read on.
> 
> You need to use the hardware handler for the same controller, you can
> setup your multipath.conf to use the "rdac" hardware handler.
> 
> Here is how your multipath.conf should look like:
> -----------
> devices {
>         device {
>                 vendor                  "$vendor_name"
>                 product                 "$product_name"
>                 hardware_handler        "1 rdac"
>                 path_checker            rdac
>                 path_grouping_policy    group_by_prio
>                 prio_callout            "/sbin/mpath_prio_rdac /dev/%n"
>         }
> }
> -----------
> 
> Note: replace $vendor_name and $product_name with appropriate vendor and
> product information for the storage.
> 
> Hardware handler for rdac is available only in 2.6.23-rc1 and onwards
> (if you are not using this version, do let me know which version of the
> kernel you are using, even if it is in distro).
> 
> Where did you get the multipath-tools from ? From Christophe's website
> or any distro(RedHat/SuSE) ?
> 
> And, as Malahal pointed, make sure you have /sbin/mpath_prio_rdac
> available and is an executable.
> 
> Hope this helps,
> 
> chandra
> On Fri, 2007-08-10 at 16:50 +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...
> > 
> > And also stil having this error: "error calling out mpath_prio_rdac"
> > 
> > Any tips, pointers?
> > 
> > Sander
> > 
> > -------- Forwarded Message --------
> > From: S. J. van Harmelen <svanharmelen xillan nl>
> > To: dm-devel redhat com
> > Subject: Re: Multipath-tools
> > Date: Fri, 10 Aug 2007 11:47:01 +0200
> > 
> > Hi again,
> > 
> > Seem to have found the solution for the first question. Got
> > multipath-tools up and running now :)
> > 
> > But please do answer the others questions if you have a minute to
> > spare...
> > 
> > Also I'm seeing "error calling out mpath_prio_rdac" when starting
> > multipathd?! Any word on that one?
> > 
> > Regards,
> > 
> > Sander
> > 
> > 
> > 
> > On Fri, 2007-08-10 at 10:27 +0200, S. J. van Harmelen wrote:
> > > Hey guys,
> > > 
> > > Sorry to bother you, but I have a question I think you can answer. I
> > > also send this message to Christophe, but I don't know how long he takes
> > > to respond. I'm trying to set up a Dell NX1950 which has an RDAC MD300
> > > array connected with linux.
> > > 
> > > Now I got all thinks working, but the RDAC driver. I'm trying to use the
> > > opensource multipath-tools (which I want to compile myself), but I have
> > > some questions about it:
> > > 
> > > 1) While compiling I get an error saying: "/usr/bin/ld: cannot find
> > > -ldevmapper" Can you tell me what I can do to fix this error?
> > > 
> > > 2) Can you tell me if there is a mailinglist for the multipath-tools?
> > > 
> > > 3) Can you point me to some documentation about configuring the
> > > multipath-tools with the new RDAC path checker?
> > > 
> > > Thanks very much for your time!
> > > 
> > > Kind regards,
> > > 
> > > Sander van Harmelen
> > 
> > --
> > dm-devel mailing list
> > dm-devel redhat com
> > https://www.redhat.com/mailman/listinfo/dm-devel
> -- 
> 
> ----------------------------------------------------------------------
>     Chandra Seetharaman               | Be careful what you choose....
>               - sekharan us ibm com   |      .......you may get it.
> ----------------------------------------------------------------------
> 
> 
> --
> dm-devel mailing list
> dm-devel redhat com
> https://www.redhat.com/mailman/listinfo/dm-devel


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