Is it possible to limit replication on OpenStack Swift to one or possibly 2? 3 data replicas are currently being created.
Reducing replication on Openstack Swift
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The default replication in Swift is 3 replicas, but you can change that to any number greater or equal to 1. The swift-ring-builder command has a
set-replicasverb for adjusting the number of replicas; seeOf course, there is a tradeoff between the number of replicas and your cluster's ability to cope with loss of disk drives and servers.
You also asked this:
I guess it would probably work ... until someone or something restarts the replicators.
But it is not a good idea:
Monitoring may complain that the replicators are not working(!)
Other swift tools may complain that the cluster is out of spec; e.g.
swift-recon --replication.If you have been previously running with (say) a 3 replica policy, then nothing will delete the (now) redundant replicas created before you turned off the replicators.