On 9/28/2012 11:40 AM, Gianluca Cecchi wrote: > Hello, > I saw some discussions in the past regarding the subject, such as: > https://www.redhat.com/archives/cluster-devel/2011-September/msg00027.html > > My config is with an rhcs based on rhel 5.8 two nodes + quorum disk cluster and > cman-2.0.115-96.el5_8.3 > openais-0.80.6-36.el5_8.2 > rgmanager-2.0.52-28.el5_8.2 > > I'm evaluating SAN migration from a storage array to another, > including data disks and quorum disks, limiting downtime and > considering pros&cons of several scenarios. > One of the problems is quorum disk moving. > > I start in a situation where the nodes are seeing both the SANs and > cluster data disks (in HA-LVM config) are already on new storage while > quorum not. > > My test approach is this: > - stop qdiskd on first node and wait for stabilization > second node becomes master > - stop qdiskd on second node and wait for stabilization > > - cluster maintains quorum (2 votes instead of expected 3 for each server) > > - format the new quorum lun with a different label > - change cluster.conf accordingly and update/distribute the config with > <quorumd device="/dev/mapper/mpnquorum" interval="5" label="nquorum" > log_facility="local4" log_level="7" tko="16" votes="1"> > - start qdiskd on first node and wait for stabilization > it becomes master > - start qdiskd on second node and wait for stabilization > >>From qdiskd point view all is gong well but openais shows: > Sep 28 11:21:00 noracs1 openais[7671]: [CMAN ] unable to re-register > quorum device: device names do not match It´s a lot simpler if you do: - drop <quorumd device="..." and just use label= (this is a general thing) - stop qdiskd on the nodes as you also suggested - format the new qdiskd device/LUN with the current label - format the old qdiskd device/LUN with another label - restart qdiskd qdiskd will find the device by label and start using the new one automatically. No need for cluster.conf updates, qdiskd downtime is minimal. Fabio -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
