Details
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Bug
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Resolution: Done
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Major - P3
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None
Description
In http://docs.mongodb.org/manual/tutorial/deploy-geographically-distributed-replica-set/, the documentation claims that you should "Ensure that a majority of the voting members are within a primary facility", however:
1) The documentation offers no explanation for why you should ensure the majority of voting members are all in one place. This seems counter-intuitive, as if this entire data center goes down, it will take a majority of the voting nodes with it, rendering the replica set unable to elect a new master. It seems that placing two nodes an the arbiter each in three different locations would be a better solution.
2) The latest version of this documentation in master states: "For more information on the need to keep the voting majority on one site, see
:doc:`/core/replica-set-elections`". The referenced page, however, only talks about network partitions, and not about the failure of a data center.
3) At the bottom of the document is this diagram:
http://docs.mongodb.org/manual/_images/replica-set-three-data-centers.png
Where there are clearly not a majority of voting nodes in a single data center.
Attachments
Issue Links
- related to
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DOCS-4011 Need a tutorial on setting up a DR site.
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- Closed
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