Does etcd directories should have the same size in etcd cluster

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Issue

Does every etcd (/var/lib/etcd) directories should have the same size ? I thought that all data in etcd was replicated on each etcd but it seems it does not work like this because /var/lib/etcd directory size are different on all etcd VMs.
How etcd with members works.

Environment

Openshift Enterprise
- 3.1.1

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