On Fri, Oct 09, 2009 at 04:58:39PM -0500, Mike Hanby wrote:
> Now that RHEL 5.4 is out with md3000i support in scsi_dh_rdac, is
> there an updated set of instructions for configuring multipath for an
> md3000i connected to a RHEL5.4 box?
Here are the relevant secitions of my /etc/multipath.conf,
with the 5.4 kernel:
defaults {
udev_dir /dev
user_friendly_names yes
}
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^hd[a-z]"
device {
vendor DELL
product "PERC|Universal"
}
}
devices {
device {
vendor "DELL"
product "MD3000i"
product_blacklist "Universal Xport"
features "1 queue_if_no_path"
path_grouping_policy group_by_prio
prio_callout "/sbin/mpath_prio_rdac /dev/%n"
getuid_callout "/sbin/scsi_id -g -u -s
/block/%n"
hardware_handler "1 rdac"
path_checker rdac
prio "rdac"
failback immediate
}
}
multipaths {
multipath {
device {
vendor DELL
product MD3000i
}
}
}
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Adam Huffman
> Sent: Thursday, June 04, 2009 8:58 AM
> To: [email protected]
> Subject: Re: Multipath , iSCSI and the MD3000i
>
> On Tue, Jun 02, 2009 at 07:08:54AM +1000, Matthew Geier wrote:
> > I'm having terrible trouble actually getting multipath failover to
> > work with an MD3000i on RHEL 5.2.
> >
> > I can talk to the array fine, but I have no path redundancy - if I
> > reboot a controller or pull one of the LAN cables, the machine hangs on
> > access to the filesystem that was being accessed via the now missing
> > path, it doesn't swap to the alternate controller.
> >
> > I've got multipathd running, multpath -l shows multiple paths, but
> > fail-over never actually happens.
> >
> > If any one else has some ideas i'll post the multipath config and the
> > path output.
> >
> > I'm assuming there is something wrong with the path selection.
> >
>
> The RHEL 5.2 kernel doesn't have a version of the RDAC module suitable
> for supporting multipath on the MD3000i.
>
> However, I've been testing some newer versions of the kernel which do
> have MD3000i support. I've only installed the latest version today so I
> haven't had time to do much testing yet, but it does look promising.
>
> The kernels are available here:
>
> http://people.redhat.com/dzickus/el5/
>
> Could you post the output of config and path output?
>
>
> Adam
>
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