Re: Multipath-tools errors

["S. J. van Harmelen" <svh@dds.nl>]

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In my last lines I meant that it looked okay:

root@storage:~# multipath -ll
backup (360019b9000d7e1100000444b46be82c4) dm-0 DELL    ,MD3000        
[size=200G][features=0][hwhandler=0]
\_ round-robin 0 [prio=3][active]
 \_ 1:0:1:2 sdg 8:96  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 1:0:0:2 sdd 8:48  [active][ghost]
vmware (360019b9000d7e1100000444846be81b6) dm-2 DELL    ,MD3000        
[size=200G][features=0][hwhandler=0]
\_ round-robin 0 [prio=3][active]
 \_ 1:0:0:0 sdb 8:16  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 1:0:1:0 sde 8:64  [active][ghost]
data (360019b9000d7ddab0000493846be81e5) dm-1 DELL    ,MD3000        
[size=200G][features=0][hwhandler=0]
\_ round-robin 0 [prio=3][active]
 \_ 1:0:1:1 sdf 8:80  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 1:0:0:1 sdc 8:32  [active][ghost]

As you can see it show's all paths correctly and also show's them as
active/ready and active/ghost. Attached is my multipath.conf b.t.w.

But I understand path failover/failback will not work without without
the hardware handler :( I am planning this machine for a production
environment, so I quess I have to wait till 2.6.23.1 comes out.

Any idea when that should be? Or are there any kernel patches I could
use for 2.6.22.2? Or does it not work that way?

Thanks,

Sander




On Thu, 2007-08-16 at 11:23 -0700, Chandra Seetharaman wrote:
> On Thu, 2007-08-16 at 19:58 +0200, S. J. van Harmelen wrote:
> > 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.
> > 
> My reply below is based on the assumption that it does use LSI Engenio.
> 
> > 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.
> 
> Yes, you need a 2.6.23-rc1 (or upwards) kernel to have the rdac hardware
> handler support.
> > 
> > I quess I need the hardware_handler to make it work as it should? Al
> 
> Yes, without the hardware handler, path failover/failback will not work.
> 
> > 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? 
> 
> I do not understand the problem you are mentioning here. Will be easier
> to follow if you can copy the o/p of "multipath -ll" and explain your
> issue w.r.t that.
> 
> Also, attaching your multipath.conf would also be useful.
> 
> chandra
> > 
> > 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
> > 

[-- Attachment #2: multipath.conf --]
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defaults {
        polling_interval        1
        udev_dir                /dev
}

blacklist {
        wwid 360019b90d736e1000e1c348acb03df8d
        devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
        devnode "^hd[a-z][[0-9]*]"
}

multipaths {
        multipath {
                wwid            360019b9000d7e1100000444846be81b6
                alias           vmware
        }
        multipath {
                wwid            360019b9000d7ddab0000493846be81e5
                alias           data
        }
        multipath {
                wwid            360019b9000d7e1100000444b46be82c4
                alias           backup
        }

}

devices {
        device {
                vendor                  "DELL"
                product                 "MD3000"
                getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
                prio_callout            "/sbin/mpath_prio_rdac /dev/%n"
                features                "0"
                #hardware_handler        "1 rdac"
                path_grouping_policy    group_by_prio
                failback                manual
                path_checker            rdac
        }
}

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