topic two nodes cluster in ONTAP Discussions https://community.netapp.com/t5/ONTAP-Discussions/two-nodes-cluster/m-p/31544#M7477 <HTML><HEAD></HEAD><BODY><P>In a two-node cluster, epsilon, the value that indicates a node as the master and a requirement in clusters with more than two nodes, is</P><P>not held by either node. Instead, both nodes are continuously polled to ensure that if takeover occurs,the node that is still up and running has full read-write access to data as well as access to logical&nbsp; interfaces and management functions. This continuous polling function is referred to as cluster high</P><P>availability or cluster HA.</P><P></P><P>Continuously polled <SPAN class="hps">who can</SPAN> <SPAN class="hps">be</SPAN> <SPAN class="hps">explained in more detail</SPAN></P></BODY></HTML> Thu, 05 Jun 2025 06:12:33 GMT wangjundragon 2025-06-05T06:12:33Z two nodes cluster https://community.netapp.com/t5/ONTAP-Discussions/two-nodes-cluster/m-p/31544#M7477 <HTML><HEAD></HEAD><BODY><P>In a two-node cluster, epsilon, the value that indicates a node as the master and a requirement in clusters with more than two nodes, is</P><P>not held by either node. Instead, both nodes are continuously polled to ensure that if takeover occurs,the node that is still up and running has full read-write access to data as well as access to logical&nbsp; interfaces and management functions. This continuous polling function is referred to as cluster high</P><P>availability or cluster HA.</P><P></P><P>Continuously polled <SPAN class="hps">who can</SPAN> <SPAN class="hps">be</SPAN> <SPAN class="hps">explained in more detail</SPAN></P></BODY></HTML> Thu, 05 Jun 2025 06:12:33 GMT https://community.netapp.com/t5/ONTAP-Discussions/two-nodes-cluster/m-p/31544#M7477 wangjundragon 2025-06-05T06:12:33Z Re: two nodes cluster https://community.netapp.com/t5/ONTAP-Discussions/two-nodes-cluster/m-p/31549#M7479 <HTML><HEAD></HEAD><BODY><P>"Continuous polling" means that the system will always check that the nodes are up and running. If one node goes down, that node is then considered as the "epsilon" node (though it won't show in cluster show).</P><P></P><P>The polling takes place on the mailbox disks.</P></BODY></HTML> Tue, 08 Jan 2013 14:19:04 GMT https://community.netapp.com/t5/ONTAP-Discussions/two-nodes-cluster/m-p/31549#M7479 parisi 2013-01-08T14:19:04Z Re: two nodes cluster https://community.netapp.com/t5/ONTAP-Discussions/two-nodes-cluster/m-p/31553#M7481 <HTML><HEAD></HEAD><BODY><P>I want to know if the 4-node cluster, a node has gone down, followed by the worst happens,</P><P>Another node goes down, It's epsilon node, This time cluster what state is, if node failure recovery, How do I restore the entire state of the cluster normal</P></BODY></HTML> Wed, 09 Jan 2013 02:17:49 GMT https://community.netapp.com/t5/ONTAP-Discussions/two-nodes-cluster/m-p/31553#M7481 wangjundragon 2013-01-09T02:17:49Z Re: two nodes cluster https://community.netapp.com/t5/ONTAP-Discussions/two-nodes-cluster/m-p/31558#M7483 <HTML><HEAD></HEAD><BODY><P>If two nodes in a four node cluster are down and one of the nodes that is down owned epsilon then the next step is to call up NetApp Support with a priority 1 support case. This is because the Vservers in the cluster might not be able to consistently serve data to clients.</P></BODY></HTML> Wed, 09 Jan 2013 17:50:32 GMT https://community.netapp.com/t5/ONTAP-Discussions/two-nodes-cluster/m-p/31558#M7483 mrinal 2013-01-09T17:50:32Z Re: two nodes cluster https://community.netapp.com/t5/ONTAP-Discussions/two-nodes-cluster/m-p/31563#M7485 <HTML><HEAD></HEAD><BODY><P>I understand that the HA configuration, each node has its own status information in real time is written to the mailbox disk, partner node continues to check whether the mailbox disk information updated mailbox disks of a node is not updated when a certain period of time,that this node has failed, right?</P><P>If so, how long is not updated, you will think that this node failure?</P></BODY></HTML> Wed, 09 Jan 2013 20:26:21 GMT https://community.netapp.com/t5/ONTAP-Discussions/two-nodes-cluster/m-p/31563#M7485 wangjundragon 2013-01-09T20:26:21Z