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Converting standalone CouchDB to clustered

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Currently I have 2 CoachDB instances, replicating with each other through the Replication/replicator feature.

Now we want to create a cluster of 3 instances. The plan is to add another instance, and cluster them all together.

Is it possible to convert the standalone instances into clustered instances? In the documentation I did not see any mention of whether cluster setup is possible (or not) for already-existing standalone instances.

A side question:

Currently, the instances are not symmetric:

  • instance #1 is small (because it only handles writes from some workers which gather data from other systems, pushing new docs to instance #2)
  • instance #2 is big (because it handles LOTS of reads from an API backend), and
  • (planned) instance #3 will be about as big as instance #2.

Will this layout/architecture be problematic?

mangohost

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