Questions on DAG quorum and setup across Sites
Posted on 2013-02-01
I have 3 questions:
1) When you are figuring out quorum for a cluster and you are using the N/2 +1 formula, is N just the number of servers in the DAG or do you include the FSW also. So if I have a 4 node DAG, is my quorum 4/2 +1 or 3 ?
2) Is it possible to stretch a DAG across two Sites with users in each Site and still have both Sites operate if the link between the Sites goes down? I would think this is something you would want to avoid because of split brain syndrome and the possiblity of the same database mounting in both Sites. Or, is it better in this situation to use 2 DAGS.
3) Assuming you go with 2 DAGS, beyond more administrative work, is there any other concerns to be aware of.
Links to articles are welcome but I would really like an answer to each question from someone with experience in these situations. Sometimes articles are not clear and make you even more confused.