What is the minimum number of HA pairs required for Epsilon to be automatically assigned?
What is the minimum number of HA pairs required for Epsilon to be automatically assigned?
Epsilon is a special vote that is assigned to a node to help determine cluster quorum in case of a node failure. In a clustered environment, at least three HA pairs (six nodes) are required for Epsilon to be automatically assigned. This is because with three or more HA pairs, the cluster needs an additional vote to maintain a majority in the event of node failures. With fewer than three HA pairs, the system uses other methods for maintaining quorum, and Epsilon is not automatically assigned.
The answer is 2. See the last two lines on the same page that others have mentioned: https://docs.netapp.com/us-en/ontap/system-admin/quorum-epsilon-concept.html "A two-node cluster presents some unique challenges for maintaining quorum. Two-node clusters use cluster HA, in which neither node holds epsilon; instead, both nodes are continuously polled to ensure that if one node fails, the other has full read-write access to data, as well as access to logical interfaces and management functions."
Read the Question.. It has number of HA pair. HA pair is 2 nodes. So you need 2 nodes which equals 1 HA pair. 2 HA pairs = 4 nodes.
True and you do not need election if its only 2 node - 1 HA Pair
A 1 HA pair
I think this is A. 1 HA pair Epsilon is automatically assigned to the first node when the cluster is created. If the node that holds epsilon becomes unhealthy, takes over its high-availability partner, or is taken over by its high-availability partner, then epsilon is automatically reassigned to a healthy node in a different HA pair. https://docs.netapp.com/us-en/ontap/system-admin/quorum-epsilon-concept.html
B-2HA. 2node cluster does not need epsilon because if they are 2node, no any problem happens for system continuity. (1node fail, another node takes their jobs.) Epsilon has the role that is another shadow vote for quorum. When is it been needed ? Yeah, minimum 4node cluster = 2HA cluster need another vote because if 2nodes are down at the same time, 4nodes system cannot judge that their system is dead or alive without another vote, epsilon.
B. If the node that holds epsilon becomes unhealthy, takes over its high-availability partner, or is taken over by its high-availability partner, then epsilon is automatically reassigned to a healthy node in a different HA pair https://docs.netapp.com/us-en/ontap/system-admin/quorum-epsilon-concept.html
If the node that holds epsilon becomes unhealthy, takes over its high-availability partner, or is taken over by its high-availability partner, then epsilon is automatically reassigned to a healthy node in a different HA pair. BUT: A two-node cluster presents some unique challenges for maintaining quorum. Two-node clusters use cluster HA, in which neither node holds epsilon. So the answer is: 2 HA pairs to enable epsilon. https://docs.netapp.com/us-en/ontap/system-admin/quorum-epsilon-concept.html