[Linux-cluster] RHEL 4.8 QDisk DM-Multipath Issue

[umesh susvirkar]

i have not use multipath on rhel 4.8

but check if is due to max length for device name as in following bugzilla
 ( following is for rhel 5.0 )

https://bugzilla.redhat.com/show_bug.cgi?id=294351#c2

try to assign name which is < 16 in /etc/multipath.conf & check if its
working.
try giving /dev/mapper/qd in your /etc/cluster.conf

<https://bugzilla.redhat.com/show_bug.cgi?id=294351#c2>
On Thu, Aug 12, 2010 at 4:24 AM, Paul M. Dyer <pmdyer at ctgcentral2.com>wrote:

> I use multipath on RHEL 5.5 with RHCS clusters.   The "multipath -l" should
> show you if your paths are available.
>
> Paul
>
> ----- Original Message -----
> From: "Mesut Pak" <mesut.pak at nscorp.com>
> To: "linux-cluster at redhat.com" <linux-cluster at redhat.com>
> Sent: Tuesday, August 3, 2010 1:16:35 PM
> Subject: [Linux-cluster] RHEL 4.8 QDisk DM-Multipath Issue
>
> MP Stationery
> I am having a back and forth with RH support on this.
> Problem is my fibre attached qdisk is dm-multipathed yet when I issue
> "mkqdisk -L" I don't see the /dev/mapper/mpath... but LUNs seen from
> individual fibre paths.
> In addition when I unplug cable (path B) for /dev/sdh1 (same as
> /dev/dm-13), that node gets fenced out.
>
> # mkqdisk -L
> mkqdisk v0.5.2
> /dev/sdd1:
> Magic: eb7a62c2
> Label: san_qdisk
> Created: Mon Aug 2 13:19:09 2010
> Host: host1
> Kernel Sector Size: 512
> Recorded Sector Size: 512
>
> /dev/sdh1:
> Magic: eb7a62c2
> Label: san_qdisk
> Created: Mon Aug 2 13:19:09 2010
> Host: host1
> Kernel Sector Size: 512
> Recorded Sector Size: 512
>
> /dev/dm-13:
> Magic: eb7a62c2
> Label: san_qdisk
> Created: Mon Aug 2 13:19:09 2010
> Host: host1
> Kernel Sector Size: 512
> Recorded Sector Size: 512
>
> Has anybody got dm-multipath working for qdisk on RHEL 4.8 cluster?
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