Here is the latest:
With emulex hba, in /etc/modprobe.conf: lpfc_nodev_tmo is 30
secs.
Changed following:
/etc/multipath.conf: "polling_interval 10", "no_path_retry 4"
(x=40)
cluster.conf: qdisk "interval 13" & "tko 4" (Qdisk failover = x *
1.3 = 52 = 13 *4)
cman "deadnode_timeout 108" ( x * 2.7) and "quorum_dev_poll
75".
With these values, we first hit lpfc_nodev_tmo in 30
secs.
After that multipathd does failovers.
It appears to work.
No longer getting kicked out of cluster while pulling fibres.
No longer getting kicked out of cluster while pulling fibres.
But mkqdisk -L output would still show non-multipath disk names in
its output.
Thanks for the input.
From: linux-cluster-bounces@xxxxxxxxxx [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of umesh susvirkar
Sent: Thursday, August 12, 2010 1:28 AM
To: linux clustering
Subject: Re: RHEL 4.8 QDisk DM-Multipath Issue
but check if is due to max length for device name as in following bugzilla
( following is for rhel 5.0 )
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@xxxxxxxxxxxxxxx>
wrote:
I use multipath on RHEL 5.5 with RHCS clusters. The "multipath -l" should show you if your paths are available.
Paul
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----- Original Message -----
From: "Mesut Pak" <mesut.pak@xxxxxxxxxx>
To: "linux-cluster@xxxxxxxxxx" <linux-cluster@xxxxxxxxxx>
Sent: Tuesday, August 3, 2010 1:16:35 PM
Subject: 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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