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Questions about install and uninstall sql server cluster

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Hi,

I have two questions about install and uninstall sql server cluster.

Question 1:

I have a two nodes (node1,node2) sql server 2008 r2 cluster instance sqlinst.

Then first i add two new nodes (node3,node4), install sql server cluster for sqlinst, second upgrade sql server 2008 r2 to sql server 2012 on node3 and node4. At this time sqlinst have 4 nodes: node1 and node2 are sql server 2008 r2,node3 and node4 are sql server 2012.

If i remove node1 and node2 from windows cluster directly without uninstall sql server first, does this impact sqlinst on node3 and node4?

Question 2:

 I setup a 2 nodes sql  server cluster. On node1 and node2 i install a sql server 2012 cluster instance sql01.

Then i add 2 new nodes(node3 and node4),on node3 and node4 i install a sql server  2008 r2 cluster instance sql02.

And i upgrade sql02 on node3 and node4 to sql server 2012. After this i install sql02 on node2 and install sql01 on node4 to make node2 and node4 public passive nodes for sql01 and sql02.

Is this installation order right? I am worried about mixed sql versions cluster installation

Many thanks.


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