All nodes participate in the quorum.  There are no dedicated "quorum nodes".  Quorum as Isilon defines it is a majority of nodes in the cluster.  So if you have a 6-node cluster, at least 4 are required for quourm.  If you have less than 4 nodes connected in a cluster that is known to have 6 nodes, the cluster will be read-only until quorum is re-established.  There is no valid Isilon config that is only 2 nodes.  A smallest Isilon config is 3 nodes.  If you lost a node, then the 2 remaining nodes would still meet quorum because 2/3 nodes are alive and connected.  You don't need any commands to set or report on quorum.  It is handed internally by OneFS.  There are no settings that I'm aware of that the user needs to view or change to handle quorum.
Hi,  I was reading about how quorum prevents data conflicts. I have the following questions -  1. If I have 6 nodes in my cluster, how do I decide which 4 nodes should be quorum? 2. What is the case if I have only 2 nodes? Is it necessary that both should be quorum?  3. When I execute the command 'sysctl' (as given in the admin guide), I do not see the status of types of quorum, I only see details about the command 'sysctl'.   Thanks and regards, Gaurav 
Quorum in Isilon