If don't use the qdisk who is the master in the split-brain? Who take the resources? What are you concerns about fence_scsi? fence_scsi in redhat 5.X doesn't reboot the node, the fenced node neve release the resources Why redhat made the qdisk as Tie-breakers and some people from support say it's one optional or some time says is not needed? <div class="gmail_quote">Il giorno 12 aprile 2012 17:51, Ryan O'Hara <<a href="mailto:rohara@redhat.com">rohara@redhat.com</a>> ha scritto: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On 04/12/2012 10:18 AM, emmanuel segura wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> That's right you'll found your cluster partitioned and if you "<cman two_node="1" expected_votes="1">" as redhat setting our cluster maybe you get data corruption </blockquote> </div> How? What fence agent are you using? I've used this configuration for years and never had data corruption.<div class="im"> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Because every node can operate with one vote an rich the quorum state Forse the fencing problem redhat implement a work around as permanent solution fence delay for some cluster agents For fence_scsi in Redhat 5.X the redhat support says it's ok for production BAAAAA not tre </blockquote> </div> What are you concerns about fence_scsi?<div class="im"> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> AND i the redhat technical tells the cluster don't require the quorum disk UMMMMMMMMMMMMM </blockquote> </div> Can you explain why qdisk would be required? Ryan <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im"> Il giorno 12 aprile 2012 16:47, Daniel Bourque <<a href="mailto:dbourque@accuweather.com" target="_blank">dbourque@accuweather.com</a>>ha scritto: </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im"> A qdisk is just another way to maintain quorum in cluster. there is a special two node cluster mode designed to allow for quorum to be maintained by the surviving node. <cman two_node="1" expected_votes="1"> </cman> But it's not very clear to me what happens with fencing if both nodes get partitioned on the network. Do they both try to fence each other off ? -- Dan </div> ------------------------------ *From:* <a href="mailto:linux-cluster-bounces@redhat.com" target="_blank">linux-cluster-bounces@redhat.com</a> [<a href="mailto:linux-cluster-bounces@redhat.com" target="_blank">linux-cluster-bounces@redhat.com</a>]<div class="im"> on behalf of emmanuel segura [<a href="mailto:emi2fast@gmail.com" target="_blank">emi2fast@gmail.com</a>] </div> *Sent:* Thursday, April 12, 2012 9:25 AM *To:* linux clustering *Subject:* [Linux-cluster] Redhat without qdisk<div class="im"> Hello all List I have a big question about qdisk in a two cluster one of out clients has too many cluster in two nodes configuration and one RedHat technical came to us and said that there is no need to use the qdisk I would to know if this is true I really think it's a bad idea -- esta es mi vida e me la vivo hasta que dios quiera -- Linux-cluster mailing list <a href="mailto:Linux-cluster@redhat.com" target="_blank">Linux-cluster@redhat.com</a> <a href="https://www.redhat.com/mailman/listinfo/linux-cluster" target="_blank">https://www.redhat.com/mailman/listinfo/linux-cluster</a> </div></blockquote><div class="im"> -- Linux-cluster mailing list <a href="mailto:Linux-cluster@redhat.com" target="_blank">Linux-cluster@redhat.com</a> <a href="https://www.redhat.com/mailman/listinfo/linux-cluster" target="_blank">https://www.redhat.com/mailman/listinfo/linux-cluster</a> </div></blockquote><div class="HOEnZb"><div class="h5"> -- Linux-cluster mailing list <a href="mailto:Linux-cluster@redhat.com" target="_blank">Linux-cluster@redhat.com</a> <a href="https://www.redhat.com/mailman/listinfo/linux-cluster" target="_blank">https://www.redhat.com/mailman/listinfo/linux-cluster</a> </div></div></blockquote></div> -- esta es mi vida e me la vivo hasta que dios quiera