Fail Over Clustering

Posted on 2012-09-05
Medium Priority
Last Modified: 2012-10-03
Dear Team,
                          While I am configuring  5 node clustering in a scenario 3 node in active and 2 node in passive. Whether all the three node will have access to the Witness disk simultaneously. Please explain me the witness disk access in 5 node clustering were 3 node in active and 2 node passive. How to come to an idea of active and passive in a clustering environment.
Question by:columbuseng
  • 2
LVL 39

Expert Comment

by:Krzysztof Pytko
ID: 38367772
Witness disk would be available only on one active node all other (4 nodes) are able to get it in case of the first one failure.

Active node is that on which resources are available and users can access them
Passive node has no resources on it and it is specified as possible resource owner in case of active would fail. Then resources from failed node are taken over by passive node which becomes an active one


Author Comment

ID: 38457423
        In my environment , 3 nodes where active . As you said only one active node will access the witness disk . Whats the use of other 2 active nodes in this scenario. Why it is said to be active.
LVL 39

Accepted Solution

Krzysztof Pytko earned 1500 total points
ID: 38457598

if they have no any resources on them then they are not ACTIVE. They are PASSIVE
Only one node at the time may hold quorum/witness disk. Those 2 nodes are passive and are awaiting for failure of the first node. In that case, quorum./witness disk is being moved to another node (defined in quorum/witness disk as preferred/possible owner) After that when some resources are on it, this node becomes an active node.

In case that node1 has quorum/witness disk and node2 has resources for FileServer (in example) then node1 and node2 are active but node3 is passive.


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