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From your question, I take it that you wish to write only to the local primary, but read from either replica set. The solution would be a sharded cluster formed from your two replica sets with their current setup. You can then setup a new collection which includes shard tagging. You should set this up so that the data which was in DCA will stay in DCA, and ...


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If it's not possible to do it automatically, can it be done manually? So only entries which are not present in the primary database A will be inserted out of one secondary of database B ? Little Example: In A we got: 1,2,3 In B we got: 5,6,7 What I want is to add 5,6,7 from database B into database A and vice versa, so it looks like this at the end: A: ...


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If you want to be able to sustain a failover of two nodes within the failover cluster, then you'll need to ensure that you have five voters for quorum. You currently have three nodes, and even if you were to add a disk witness, you'd still be at the same point: whether you have three or four possible quorum votes, you'd still need to have three votes for ...



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