Hello,

We do have a running SolrCloud cluster, a simple set up of 4 nodes — 2
shards and 2 replicas and ≈ 140GB index. And now we have to move to another
server and need to somehow copy existing index without downtime (if
applicable).

New config is exactly the same, same 4 nodes, same collections and their own
zookeeper.

What options do we have?

What I was thinking about is to add 2 nodes (from the new cluster, those
that are supposed to be shards) as replicas for the existing old cluster and
when the replication is done simply switch the app to use those new
replicas. Then reconfigure these replicas and run them as shards with their
own zookeper. So there will be minimal downtime just to restart the new
cluster.

My concerns are:
* Will those new replicas be automatically populated with the index from the
old cluster?
* Will I then be able to disconnect them from the old cluster and run as
primary shards with their own zookeper and then add their own replicas from
the new cluster?

Thank you,
Alex



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