[dm-devel] RHEL5 and RDAC/Multipath

[Sunil Joshi]

Could you try using in your default settings

 no_path_retry           queue




Regards
Sunil Joshi


On 9/24/07, Nuno Fernandes <npf-mlists at eurotux.com> 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-mpath-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
> https://www.redhat.com/mailman/listinfo/dm-devel
>
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