[dm-devel] RHEL5 and RDAC/Multipath

[Nuno Fernandes]

Hi,

It's working. For IBM DS4700 i only had to  change in the multipath.conf

vendor "IBM"
product "1814*"

I didn't try it but shouln't be using prio_callout /sbin/mpath_prio_rdac??

Thanks
Nuno Fernandes


On Monday 24 September 2007 19:30:31 Chandra Seetharaman wrote:
> Hi Nuno,
>
> I would suggest you to move the rdac specific configuration information
> to device section and retry.
>
> Are you running the multipathd command ?
>
> Here is how my rdac configuration looks in multipath.conf
> --------------------------
> devices {
>         device {
>                 vendor                  "IBM"
>                 product                 "1815"
>                 hardware_handler        "1 rdac"
>                 path_checker            rdac
>                 failback                immediate
>                 path_grouping_policy    group_by_prio
>                 prio_callout            "/sbin/mpath_prio_tpc /dev/%n"
>         }
> }
> -----------------------------
> Let me know how it goes,
>
> chandra
>
> On Mon, 2007-09-24 at 14:39 +0100, Nuno Fernandes wrote:
> > Hi,
> >
> > We've bought and IBM BladecenterH and IBM DS4700 storage.
> > We are using Redhat Enterprise Linux 5 and we are trying to put multipath
> > working.
> >
> > RHEL5 we are using uses 2.6.18-8.1.3.el5xen. We've ported rdac patch
> > (http://kernel.org/pub/linux/kernel/people/agk/patches/2.6/2.6.21/dm-mpat
> >h-rdac.patch) to RHEL5 kernel. We've also updated multipath-tools to
> > support
> > mpath_prio_rdac.
> >
> > Our multipath.conf is:
> >
> > devnode_blacklist {
> >         devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
> >         devnode "^hd[a-z]"
> >         devnode "^cciss!c[0-9]d[0-9]*"
> >         #USB 4G Flash drive inside HS21
> >         devnode "sda"
> > }
> >
> > defaults {
> >         multipath_tool  "/sbin/multipath -v0"
> >         udev_dir        /dev
> >         polling_interval 5
> >         default_selector        "round-robin 0"
> >         default_getuid_callout  "/sbin/scsi_id -g -u -s /block/%n"
> >         #default_prio_callout    "/bin/true"
> >         failback                immediate
> >         path_checker            rdac
> >         hardware_handler        "1 rdac"
> >         prio_callout            "/sbin/mpath_prio_tpc /dev/%n"
> >         path_grouping_policy    group_by_prio
> > }
> >
> > multipaths {
> >         multipath {
> >                 wwid                    3600a0b8000320bea0000048f46e52137
> >                 alias                   client_data
> >         }
> > }
> >
> > When we start multipath -v2 it creates multipath devices. I can see 2
> > active paths (active controler) and 2 ghost paths (standby controler).
> > When i unplug 2 active fibre that connect the fabric to DS4700, multipath
> > reports I/O errors and doesn't failover the controler.
> >
> > Any ideas?
> >
> > Thanks for any help
> > Nuno Fernandes
> >
> > --
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> > dm-devel at redhat.com
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