From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Phillips Date: Thu, 18 May 2006 12:21:29 -0700 Subject: [Ocfs2-devel] Fencing in OCFS2 In-Reply-To: <446CC185.9090306@oracle.com> References: <446CC185.9090306@oracle.com> Message-ID: <446CC939.8060502@google.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ocfs2-devel@oss.oracle.com Zach Brown wrote: > Sum Sha wrote: > >>With some experiments and going through OCFS2's quorum code, I am sure >>that in case of serial split-brain, quorum algorithm will surely break >>and will cause complete cluster shutdown. It will cause all the >>subcluster nodes to panic themselves. Please correct me if I am >>wrong... > > Can you provide the details that lead you to be sure of your analysis? It seems to be the intended behavior. No node is a member of a quorum group so all nodes should be fenced. This is correct. What is wrong is the idea that fencing is equivalent to panicking. No! Fencing means preventing a particular node from writing to shared storage. The FAQ item is incorrect. How about this instead? Q03 What is fencing? A03 Fencing is the act of preventing a node from writing to shared cluster storage. Regards, Daniel