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. But mkqdisk -L output would still show non-multipath disk names in its output. Thanks for the input. ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of umesh susvirkar Sent: Thursday, August 12, 2010 1:28 AM To: linux clustering Subject: 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 <https://bugzilla.redhat.com/show_bug.cgi?id=294351#c2> On Thu, Aug 12, 2010 at 4:24 AM, Paul M. Dyer <[email protected]<mailto:[email protected]>> 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" <[email protected]<mailto:[email protected]>> To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> 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? -- Linux-cluster mailing list [email protected]<mailto:[email protected]> https://www.redhat.com/mailman/listinfo/linux-cluster -- Linux-cluster mailing list [email protected]<mailto:[email protected]> https://www.redhat.com/mailman/listinfo/linux-cluster
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