Details
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Task
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Resolution: Done
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Major - P3
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Description
Many of our customers have questions regarding the best practices for setting up a replica set across two sites, for the purposes of having a disaster recovery location.
These discussions always include a few common topics:
- How a majority is needed for elections.
- The value of a third site arbiter (possibly in the cloud).
- The value of having a full data node in third site, in place of arbiter.
- The pitfalls of manual reconfiguration at disaster time, to try and make the two site solution work.
- If you must do two sites, steps for going into DR mode, as well as coming out of DR mode.
- Setting replica priority so the main site is primary when possible.
Having a tutorial or other page which explains all this clearly is very much merited.