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



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


On Thu, Aug 12, 2010 at 4:24 AM, Paul M. Dyer <pmdyer 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 nscorp com>
To: "linux-cluster redhat com" <linux-cluster 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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